Is it better to top for Medisave, SA, or SRS first?

Just to add a few key points in addition to what @Shaun had given:

1. There is an annual limit of $37740 for total MC and VC for the year when you do your VCMA. Any excess over the limit would be refunded without earning any interests.
2. Subject to the limits, you can get full tax relief for VCMA and SRS, but RSTU is capped at $7k.
3. SRS penalty-free withdrawal can start from age 62.

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Depends on what you value more and what is easier to achieve or motivate you.

Medisave
Use case: medical expenses
Target (2021): BHS is $63,000

SA
Use case: retirement payouts
Target (2021): FRS is $186,000

SRS
Use case: retirement payouts
Target (Annual):
$15,300 (SC/SPR)
$35,700 (Foreigners)

All can claim tax relief if you do voluntary cash top ups. Please do read up on the T&Cs at IRAS for more details.

Once MA reached BHS for the year, the mandatory MA contributions will flow to SA, if FRS not reached in SA.

CPF cannot touch till 55.
SRS can touch before 55 but got penalties for early withdrawal.

I started with MA top up first as it was more achievable.
Now I do some ad-hoc SA and SRS top ups but still some ways to go before reach FRS.