IMO Versa best because fastest relative to gains (StashAway slow withdrawal at least 3 biz days to arrive back in bank account, TnG GO+ fast transaction but gains bad)

You can invest in MMFs through conventional investment platforms like Public Mutual, Affin Hwang, HLAM, FSMOne etc. Just that compared to the 3 you listed, starting capital + minimum deposit is quite high. The three options you listed because they essentially "pool" users money together and invest on behalf, you can deposit as low as RM1.

Also I recall FSMOne go their own MMF called Cash Solutions, but I never used so I'm not familiar.

Breakdown on terms in daily returns, Versa beats them hands down with RM1 returns is RM0.0009 while GO+ is the lowest at RM0.0004

SA simple forget about because the underlying fund is lousy coupled with slow redemption. You will be better off with projected Versa returns this year and better flexibility in withdrawals as it only takes 1 business day to received the money

Don't read Versa and StashAway's projected rates. They're predictions that look nice to attract customers. The real tracking is following the underlying funds HWAEDEP and PRUISIN, you can follow on sites like MorningStar.  Study the 1M, 3M, YTD and 1Y returns, look at the portfolio, and you can make a more educated guess on the actual returns.

PRUISIN (StashAway Simple): https://my.morningstar.com/my/report/fund/p...px?t=0P0000GEZP

HWAEDEP (Versa):
https://my.morningstar.com/my/report/fund/p...px?t=0P00008ME1

PRUISIN's heavier weight in deposits is most likely going to bite the fund's earnings unless low interest environment improves abruptly in later half of the year