Mainly all melee jobs are easy to start off with. Also Rogues and Thieves are not that similar at all. Only thing is probably is Rogue's backstab, and Thief's trick attack. You'll pick up on the game very fast, and Rogue is very adaptable and easy to use during the first 10 levels, before you pick up dual wield and your other combo moves. It's all up to choice too, if you love how Rogue's look and act, then be one.