Fighters are definitely easier in the beginning. Archers take kind of a long time to really hit their stride, since you don't get the good dot/aoe skills until later on. But after they get their kitable aoe, archers are great at solo grinding.
Fighters who can tank will do well with boss farming (either solo if they're really good tanks or duoing with a cleric) and will also be in demand for parties. So if you decide to make a DD fighter, it's a good idea to have the capability to tank as well. Keep a shield and 1-hand sword handy along with scrolls and potions. Squishy fighters aren't quite as welcome in parties who need a fighter to tank.
