I am kind of on the fence on which one might be a little better for my character.

Synth:
You can 'mostly' keep up with the higher end gear for your character level. You do get to craft nice purples when you get to level 50 although I am not sure how the grind for these is going to be or how valid they will be a few weeks after someone starts to raid. Not sure what the advantages are beyond that.

Art:
Once you get a piece of custom grade gear you can keep modding it all the way to 50. Most of the gear upgrades/replcements happen often enough with questing and random drops that. You can also make offhands for you and your companion.

Any thoughts on which is better?