Low elo (silver) player here: is duelist the easiest class to rank up with? I enjoy playing controller characters but in low elo it often feels like a team deathmatch and to win you need to get the kills, so it seems very hard to rank up with the controllers. Is it actually easier to rank up with the duelists?

If I get good (say platinum or diamond) and switch to controller since that's what I enjoy, will it be harder to improve more since I don't have the experience playing those characters?