The first advantage of an online bank is its low cost. The main services are free, such as withdrawals of money, bank card, checkbook. However, you have to be careful about the other paid services you may need so you do not end up with exorbitant prices on the transactions you need every day. This is why you must consult all the proposed rates, and read the fine print on their contract proposal.
You can compare interest rates in the medium and long term.
Also check which consumer service or after-sales service the bank offers.
Does the bank provide you with a dedicated bank advisor?