That's up to individual to decide.
If all RA, including top-ups to ERS goes to CPF Life at the point of choosing CPF Life plan, then you are merely placing more in a betting pool in which some must lose for some to gain.
It would be more palatable if top-ups to ERS remains in RA when one chooses the CPF Life plan with FRS. But the answers you got from CPFB is not clear on this and also it does not say the period over which the amount in RA can be withdraw (as AMP) after choosing CPF Life plan.
May be the following Q&A can help you
Just double confirm
(Q)
1.) Top-up 178,000 at 1st Sept 2019
2.) Apply for CPF-Life
3.) Get Monthly Payout let say $1,000
4.) Next year, Top-up $30,000 at 5th Jan 2020
Q1.) After top-up $30,000 at 5th Jan 2020 and in the following month 1st Feb 2020, she will receive her payout = $30,000 (AMP) + 1000 (CPF Life payout) = $31,000. Am I right?
Q2.) If above statement is correct , how fast do she need to apply Extra Annuity before the amount returned to her in the Form of AMP ? Is it be before 20th Jan 2020?
(A)
Based on the top-up amount that she receive in her RA, we are then able to compute and determine the AMP. She will be able to receive a smaller portion from the top-up amount of $30,000 in the form of AMP and not the lump sum of $30,000. The AMP will be paid on top of the current LIFE payout she is receiving.
If she wish to receive the AMP immediately, she will need to write in to us (via letter/e-Concierge) to request the AMP. Otherwise, she can wait for the AMP during the annual payout review in July.
She can also consider purchasing an additional annuity for her LIFE plan at any time as she wish to, as long as she has made/receive top-ups to her RA.
The difference between requesting AMP and purchasing an additional annuity is that:-
1) The AMP will be paid to the member until the RA savings are exhausted; whereas
2) The member can receive higher LIFE annuity payouts for as long he lives if the member purchases an additional annuity.