Unfortunately this is one of the cases that the "best" platform will completely depend on what country you're in.
Personally, since I'm currently in the Philippines, my only choices(as far as I know) are pretty much limited to either eToro, trading212, or the sort of "feeder funds" that are accessible through local banks(which I'm not a fan of). Not sure where you're from so I really can't make recommendations, but probably check out both. For the United States people though, I've heard M1 Finance is pretty good.