I played both and I can say GW2 is by far better. I solo'd most of each and I ended up quiting SWTOR because it got boring. Worlds are pretty dead too. Sadly, I think because they try too hard to make these games appeal to the casual crowd to have a bigger launch base but, they end up dying fast.

It's really hard to maintain longgevity when people cam max level within 1 day of its launch. I think also the de-emphasis on party play kills it too. Sure its fun to solo, but I think to keep a game going. Relationships with other people are needed, and you really get that in parties. Plus, fights are more or less just spamming w/o rhyme or reason.