I've seen that neon has 0% fee for investment plans and there's no conversion fees since it's done at the BX Swiss (so no commissions). So would it be more interesting, for example, to invest in NASDAQ 100 each month via Neon and have theoretically no fees (except the stamp), or do it via IBKR ? The only "issue" I see is that you can't buy partial stocks via Neon but I don't think it's a massive problem.