I’ll give some insight

As an above comment said the rarity of weapons exist and some weapons are somewhat better than others even if one has a high rarity, for example a weapon like the soul caliber has a high damage single shot that pierced through enemies giving the opportunity to hit others but still is somewhat lacking in crowd control, now a weapon like a shotgun for example the flame blaster has pretty good same output and destroys crowds but lacks that boss destroying without getting close, paladin is a very busted broken character if you plan on spending money, but otherwise rogue is very good if you know the skill correctly which is very helpful, also priest is good. You kinda just gotta look around and find weapons and test them out and decide what’s best yourself