I cant decide on a champ

Go with Brand.

Pls be specific, which lane/role do you like best? There is no "best" champion. You should test them when they are free to play and decide urself. But in my opinion, i prefer riven.

Brand is the best because the other two have AIDs.

is pretty good with how popular is right now.

Malz is prob the best because he's strong and underrated. So u don't have to worry abt him getting banned.

Riven is somewhat weak at the moment, Malzahar is solid but might actually get a rework in the near future along with some of the other immobile mages, Brand is ridiculous right now, with Rylais he can slow for days and he deals crazy damage.