Hard to compare Syfe and FSM as they don't have the same products. But if we are just talking about RSP (buying only, no selling), as long as the RSP amount is more than S$153.80, FSM would be cheaper than Syfe. For example, if you want to accumulate a final $10,000 AUM in a year, if you RSP 40 x $250 over 1 year, Syfe would cost 0.65%*10,000 = $65/year (It's actually a bit lesser as the cost for accrued daily and billed monthly). FSM would cost $1 * 40 = $40/ year. Not that FSM allows such RSP more than once per month anyway.
For the same final AUM, Syfe is better than FSM if you wanna invest small sums (less than $153.80) very frequently ( more than once per month), otherwise for bigger RSP amount FSM is better. But there is actually no identical product to compare between Syfe and FSM.
For the same final AUM, percentages don't add up like what tutonic calculated. Eg. 0.08% x 10 * 1,250 is the same as 0.08% * 1*12,500 and 0.08% * 5 * 2,000 + 0.08% * 2 * 1,250 etc, you get the idea. Pls correct me if I'm wrong.