Hi everyone, I have a question, what is the difference between a FSMOne and SGX account?

Hey Anon, the main difference between the two is that FSMOne is a custodian account while SGX is a CDP account. Next, the main difference between a custodian and CDP account is

1) If you buy shares using a custodian account, you can only sell those shares using the same custodian account. Whereas if your shares are held in your CDP account, you can sell those shares using any brokerage platform that supports selling through CDP, so long as you have linked your CDP account.

2) Typically, the buying and selling fees using a custodian account is cheaper as compared to CDP.

I'd suggest using both. For me, I use DBS Vickers Cash Upfront to buy SG shares which will be credited to my CDP account and I will sell those shares using FSMOne. Reason being that you get the best of both worlds in terms of fees. With DBS Vickers Cash Upfront you pay about the same fees as a custodian account, around $10, excluding the clearing, SGX trading, and SG fees. You can then open an FSMOne account and link your CDP account to it, you'll then be able to enjoy the same rates when selling as DBS Vickers Cash Upfront is only for buying, the fee for selling is about $25 if I recall correctly.

TL;DR Use DBS Vickers Cash Upfront to buy and FSMOne to sell

I think the comparison you're trying to make here is between a CDP and a custodian account (FSMOne). You can read more here: https://blog.seedly.sg/cdp-vs-custodian-account/