I went with The Spiritshaper (Difficulty Rating 3* out of five, equal easiest with Gunslinger). There's a decent explanation of what you might expect from each in terms of gameplay and there's also a difficulty rating.
There are six - Blademaster, Vanguard, Swordmage, Occultist, Spiritshaper and Gunslinger. The game does a bit better when it comes to Classes. RO doesn't even the usual option of 'human with cute animal tail and/or fur' or 'human with pointy elf ears'. Unlike Western MMO players, a significant subset of whom like to play non-human and even - *gasp* - ugly races, the Eastern market apparently demands humans, humans and more humans. You can be a human or a child-like human and that's that. The other problem, about which nothing will ever be done, is the utter blandness of the 'races' you can choose.