Hey there, welcome to the Metin2.SG forum, here you can find a lot of interesting stuff, why don't you register your account? It only takes a minute! Click on the "Forum Login or forum-register" button on the top-left corner!
I would say there is no strongest class, every class is strong and have their own benefits with their S skills. If u want to tank badly I would suggest u wep or bm sura. If u wanna make skill dmg mental warrior and mages, if u wanna have a Allrounder with hits and skills then sins and body warrior.