So, i'm almost reaching 4800 IP and i want a good mid champ, but i can't choose between this 3 because all of them look pretty awesome! I always liked Talon, but Kassadin and Malzahar got my attention too recently!
What do you guys think it's the best option?
P.S - I'm main Jhin, and as supp i play rakan ... if that can help a bit
Imo
Talon: The most enjoyable of the 3
Malz: The strongest on the 3
Kassa: The most underrated of the 3
Talon it's fun to play, he shine in the Mid game and is favorite by the actual meta. Tanks will be your PITA, Roaming and supporting other lane your objective.
Malz it's very flexsible champ can be plaied in almost any role. His farm is undeniable and his combo clean and easy to land .... Pretty hard to mess up with him, require only a bit of positioning ability.
Kassa .... Have some issue in the early game but a soon as you hit 6 you can put tremendous pressure on yours and others lane. A lot tends to understimate his dmg potential and that's a huge mistake. Endgame with a Lichbane he can easely destroy any squishie.
different purposes
Most people say you should have two to three Champions in your Champion Pool per role with contrasting playstyles so that a) you're not screwed if one gets banned and b) you can pick to complement your team comp.
I'd honestly say you should learn both Kassasin AND Malzahar. Ekko is a pretty good substitute for Kassadin as well (he has a pretty good lane phase for a Melee Assassin and he can bring more than just Damage to a teamfight).
Best mids who have it all from my experience.
get raped by any AD champ ... good only against Mages
... 
but good against Mages
is good but he is better top or against melee mids
