Ill always prefer wows game engine over swtor... imo its swtors biggest downfall.
Ability delay and failure has always plagued this game and it will never change. Wows gameplay feels very crisp and fast compared to swtor. When you use an ability in wow it happens right now, whereas swtor is always a step behind.
Of the 3 mmos Ive played. Gw2, WoW, and Swtor. Each one has pros and cons.