Katar raider = the most commonly played class, very fun because you can stealth/cloak, attack fastest, highest 1 to 1 damage output in dungeons, best candidate for boss stage, one of the best orlo boss gem farmer
Dual raider = rapidly growing class, because freezing assault and enfeeblement+crippling storm is the key skill to make dungeons easy to go through, and the way how this class is designed works good with a CHA build which indirectly make their party buffs work so good as well, their mspeed/attack speed buff are so helpful to your teammates in dungeons. FYI, a dual raider beats a katar raider in 1 vs 1 PvP
Bow scout = also a commonly played class because they belong to hawker who can camouflage, but it is currently the weakest class (I think still better than launcher artisan though), definitely not your 1st thing to play if you just return, because everything you do is like handicapped and requires assistance to go through
Xbow scout = one of the least played class because it is just not fun to play it, one of the lowest damage output class, yet not tanking as good as a xbow knight, don't bother with this
Axe champion = best 1 vs 1 class among all types of champion, but do pretty bad in PvM, unless you can spare yourself some PvM AOE skill which you can only use in PvM not PvP. Currently the highest critical rating class among all, however one of the worst accuracy weapon at the same time
Sword champion = this do well in both PvP and PvM, and has the potential to out-AOE-damage output a spear champ if you spare some SP for PvM AOE, the weakness of this class in PvP is that their AOE radius is rather small, (two big two small), but they do good damage because of pierce defense passive along with skill power, this weapon is the highest accuracy weapon
Spear champion = normally the best class for leveling and everything PvM in general because of the AOE radius and the way how this class designed where you benefit so much from making it a CHA type, you can often run into a moment where your berserk cry or combat scream can stop everything from reaching you, and you take no damage from mobs unless they are ranged monster. PvP wise, this class has the fastest attack speed and biggest radius AOE, but nothing else since PvP longinus strike is nerfed
1-hand knight = no question about it, best tanker in the world currently, and with 4 AOE (2 strong 2 weak), which is sufficient to kill stuff, one of the easiest class to play due to how well you can survive and how well you can kill
xbow knight = never try it, but it's a step up from xbow scout class, but don't bother because it doesn't have any AOE, one of the lowest 1 to 1 damage output, making it you absolutely useless in dungeons besides tanking, you would take a 1-hand knight than an xbow knight any day
Launcher bourg = 1 vs 1 situation in both PvMPvP is absolutely disappointing, so the only way you could build this class is to make yourself best in terms of skill spamming. In other words, skill power, AP, mspeed, CON, STR will be your friend, no exception. This class is only fun in PvP when you have a group of people for you to AOE, which is crystal defense but it is no longer activated due to recent inactivity due to declining population
Gun bourg = underplayed class, but perform godly if played right. Attack speed is just one step below katar raider, it is the 2nd fastest attack speed class and damage output. One of the best class to farm orlo boss because of killing speed and you have stockpile as a bonus. PvP wise, you can stomp the bow scout like an ant. You won't have any problem as long as you stick with a cleric around you, doing quite well in 1 vs 1 as well because augmenting reflection is 100% attack speed + 25% reflect buff.
Artisan = don't have the 100% attack speed buff like the gun bourg class but 10% more pierce defense than gun bourg, you can craft useful stuff but not gonna mention, definitely not recommended if you just returned because the difficulty to level it up and gear it up. I will take a gunbourg than an artisan any day
Support cleric = highly demanded class for PvP games and dungeons, but they went extinct because of the recent trade restriction changes, people cannot bother to gear up a support cleric, they need to focus on their beloved hawker class instead of gearing up a cleric, but if you wanna do some TG business. You can't live without a buff slave, a stat buffer and a max charm cleric are mandatory
Battle cleric = currently overpowered due to how well you can kill and how well you can tank at the same time, not recommended as a first class to play due to some issues you could face if you play dungeons and PvP games because when you join these games, you indirectly get people's hope up, but the fact is you have to let them down because you are a battle cleric which will not have buffs/heals
Mage = can stand its own ground if played correctly and highly experience, but the potential can only be unleashed with a very good player skill, 90% of the players cannot handle this class, it is the reason why it is one of the least played class among all in PvP. Along with the reason that I mention earlier where people cannot bother to gear up a mage when they are busy to gear up their beloved hawker class