Standard Chartered Bank launches Multicurrency Forex Card ...

I have always used an airmiles card for Singapore Airlines miles. I might not be flying in the near future so thought about applying for a second credit card, and I thought cashback is the best deal right now. Has anyone researched the best cashback credit cards?
I thought the only ones worth considering are:
- UOB One card - gives you fixed cashback of SGD300 if you spend at least SGD2,000/month for 3 consecutive months (or 5% cashback if you spend exactly SGD2,000/month as you get no cashback for the excess) and fixed cashback of SGD50 or SGD100 if you spend at least SGD500/month or SGD1,000/month, respectively for 3 consecutive months (or 3.3% cashback if you spend exactly the minimum) (but dealing with UOB is the most painful experience on the planet; this is a bank that will send you a SMS that they sent you a physical letter to ask you to send them an e-mail)
- American Express True Cashback - 3% on first SGD5,000 if you spend SGD5,000 within first 6 months; 1.5% otherwise with no minimum (great as a second card if you hit the cap of another card and regularly spend beyond the SGD2,800 spend limit for cashback of the UOB One; also gives you 2.5% cashback on non-SGD spend but you would save by using Transferwise or a similar challenger bank card to pay for lower forex rather than paying an inflated credit card forex rate and getting 1% back)
- HSBC Advance - SGD150 on first SGD800 if you spend SGD800 in first month; 1.5% up to SGD70/month otherwise (2.5% if you are HSBC Advance client); 2.5% for dining, utility and telco bills with SGD2,000/month minimum spend (could be useful as a second card like the Amex True Cashback)
- UOB YOLO - gives you 8% cashback (capped at SGD60/month or cash back on up to SGD750/month spend) on weekend dining, entertainment and Grab (3% on weekdays) with minimum SGD600/month spend (could be useful if you are ordering fancy weekend takeout a lot right now)
- OCBC 365 - gives you 6% cashback (capped at SGD80/month or cash back on up to SGD1,333/month spend) on dining and online food orders, and 3% cash back on grocery, telco and utilities, with minimum SGD800/month spend (could be useful if you are ordering a lot of takeout right now, but OCBC is also harder to deal with)
- DBS Live Fresh - gives 5% cashback capped at SGD60/month but requires minimum spend of SGD600/month; gives actual monthly cashback of up to SGD20 on SGD400 per category for "online", "eligible Visa Contactless", and all other spend (you get up to SGD40/month cashback on SGD800/month spent in two broad categories (online and Visa contactless) but a lot of hassle for up to 3 x SGD20/month and useful only if you spend so much (and still want to squeeze out this SGD60/month of cashback!) that you max the cap on the better cards; again, you might make a loss by forgetting about the card and having to pay late fees, annual renewal fee, etc)
- Maybank Friends and Family - 8% cashback (capped at SGD80/month or cash back on up to SGD1,000/month) on groceries (including online grocery), fastfood (including Deliveroo and Foodpanda), petrol, ride hailing, and telco, with minimum SGD800/month spend to receive 8% rate (useful if you spend closer to SGD1,000/month on groceries but that's not everyone)
Other options (that are nowhere as good as they first seem) would be:
- Citi SMRT - gives 3% cashback on "online" shopping and 5% on selected groceries, McDonalds and other fastfood, Starbucks and other coffee, movie; minimum spend of SGD300/month (plus 2% on ez-Link top up, if you want a couple of dollars more a month!) (looks like a huge hassle because you get "SMRT$" instead of real dollars up front; could be useful as a second card if you max out the caps of the better cards, carefully check if a merchant counts as "online", and if you buy your groceries at Fairprice, Giant or Sheng Shiong)
- Citi Cash Back - gives 8% cashback capped at SGD75/month for dining, grocery and petrol but requires minimum spend of SGD888/month; gives actual monthly cashback of up to SGD25 on SGD312.50 per category for dining, grocery and petrol (a lot of hassle for up to 3 x SGD25/month, you might make a loss by forgetting about the card and having to pay late fees, annual renewal fee, etc)
- POSB Everyday - could be useful if you shop at Sheng Siong and the other places covered by the card
- Bank of China family - gives you 10% cashback on dining of up to SGD25/month on SGD250/month and 3% on online shopping, with minimum SGD800/month spend (if you want to do the accounting acrobatics to keep track of the details...)
- QUESTION - Maybank Visa Infinite - featured in the Straits Times June 14, 2020 edition as being the only card that racks up rewards points for insurance premiums, but I cannot figure out the card based on the Maybank website. It emphasises air miles as its perks and says it has a SGD600 annual fee (waived for SGD60,000 annual spend).
Has anyone else applied for non-airmiles cards? Happy to hear people's thoughts.
UPDATE: I was wondering what the best spending plan is for someone who spends at least SGD2,000-3,000/month. Below that, you should focus on the minimum spend for one card and above that, you would put the excess in a card like the Amex, Standard Chartered or HSBC Advance with a no cap 1.5% cash back.
I was thinking:
DBS Live Fresh - Spend your first SGD800/month of online and Visa contactless on this card (two broad categories) for 5% cash back
UOB Yolo or OCBC 365 - Spend up to SGD 750 or SGD1,333/month on weekend dining or dining and other qualified spend here for 8% or 6% cash back
UOB One - Put your spend that does not go to a higher cash back card here and make sure you hit exactly SGD500, 1,000 or 2,000/month for SGD50, 100 or 300 cash back/quarter (again, you get no cash back for the excess)
American Express True Cash Back - Put your spend here after you hit the monthly target on the UOB One
UPDATE: I tried applying for the UOB One, took UOB two months to process my application, then they say after approval, they need two business days to process the release of the actual credit card then two business days to deliver. I tried HSBC, Amex and DBS and they processed and delivered the actual card on the third business day after application (not after approval but after submission of the application)