It seems that the same thing happens in every MMORPG I play...
1) Armor crafters generally make more than weapon crafters There are simply more armor slots to fill than weapon ones, therefore your market is bigger. Defensive fighter classes rely on armor more than others, so their needs will be addressed accordingly. So, I would expect to see Armor and Weapon Blacksmithing become the #1 and #2 trade-skills.
2) Both itemization and supply & demand will favor certain types of weapons over others. Swords and Axes, for example, will probably do more damage than say...staves and maces - even though a given class may be able to use all of them. The min/max players will therefore increase demand on the "good" ones, and ignore the "bad" ones. Crafters will in-turn produce large quantities of the "good" pieces, shafting classes with specific needs and relatively limited choices (*cough* monks *cough*)
3) Given points 1) and 2), most crafters will probably ignore us. We are not seen as tanks, so we won't need the "best" armor in the game, and our fists (which I admit are pretty good) will be seen by many as adequate weapons. It's probably going to be up to us to supply our own gear.
Me? I think I'm going Outfitter - but I haven't looked into Woodcrafter yet.

*edit* I really hope Sigil takes steps to set Vanguard apart from the "usual" MMORPG. But it may take some time to get things right...