Which bank account is the most suitable for me and has the highest interest rate?

For high yielding bank accounts without any spending criteria, citibank's maxigain and cimb fast saver are the best. Can consider Singapore savings bonds as well just that it will take a month to withdraw funds if needed. You may want to consider splitting this pool of 150k between citibank and ssb as 150k is the threshold limit to earn the best interest under maxigain. I.e. If you put everything into maxigain and the next month's interest crediting causes the balance to go beyond 150k, the base interest will be drastically cut.

Hope this helps

I currently have my Citi Maxigain savings account topped up to 100k (because beyond 150k, you don't avail the step-up interest of 2%). Currently that gives me the best interest rates with no hassle of minimum spending etc.

For the rest, I use Standard Chartered Bonus Savers account (but am not liking the minimum card spend), and the rest I have in CIMB for all the rest of it.