Imo until you get to level 95 or more, spear's a better all-round weapon. Sword is neat but the first job skill versions have absolutely lousy range. Once you can get most/all the 2nd job skills at 95/110, sword is spear's equal, if not better.
As for build, concentration tree is the better imo but, if you choose to get both attack trees, you won't be able to get hardly any misc at all. I didn't mind this since I think warrior/warlord misc is also lousy but others might disagree. If you do single tree, most prefer twin blade sword and windmill spear.