well, it's all depend on you. melee is good (especially 2 hand sword) when it come to pvp since the amount of burst is totally ridiculous. But their defense and health is weak so you will need a healer or you might consider 2nd and 3rd class to be auramancy and vitality.
Magic is fun and safe to play, it is also a fast way to grind level. In my opinion they all have their own ways through dungeon and pvp, so don't worry about you will lose pvp if you chose the wrong class.
make sure you use all of your skills and combos proficiency then there's no problem at all.
Im playing as battlerage + auramancy + optional ( depend on the other player I play with )
I also consider socerer + vitality + auramancy
If you play alone, dont forget about defense and heal. If you play with friend, depend on your friend, you can go all damage or defend as you will.
by the way, my name is ryujikenshin in game. Im new too. I'm still research around for the best class. please pm in games if you find out anything news.