Beginner firendly classes:
Gunlancer: very tanky easy dps hard to die. Aloe and very bad spacebar ability
Scapper: good movement skill, good stagger and destruction, with easy dps
Berserker: very tanky class,but long animation lockdown
Bard, paladin: pala tankier than bard, and bard have little bit harder playstyle.
Shadow Hunter: fast, easy dps nice dodge abilty,and tanky character.
Scouter:Basicly ranged shadow Hunter
Summoner: I dont know much abaout her.probably beginner firendly class
Hard classes:
Gunslinger: have many reason: lost of stance change, most dps skill have animation lock. Need to do constans dps while dodgeing boss paterns, and very squshi class . Gunslinger have high love ability and also hitmaster class, but most people dies because they greedy for dps or just dont have enough experience to do optimal damage while dodgeing mechanics.
Deadeye: ( I not play this class so this is what I heard so far). He have weapon swap but this is not the hard part because he just swap between shutgon and pistol. The hard part is that he is a back attack class, and her main dps skill do optimal damage when meele range, and he is also papper character.
Soulfist (still not play this class): you need to preplan your skill, and if you play eo than also lots of button pressing.
Arcana: you collect 4 stack Than do your burst damage, its normal just some other class. Hard part is you also need to draw cards and use them when needs. So you need to looks them every times,and this is the mechanics the most people dies.
Reaper: I dont know how it works.i only know that is a hard class.