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I've played SWTOR up to level 50, and Tera up to 22. Let me tell you something about them straight off the bat, they are both "grind" games of "kill x" and "collect x", or "kill named mob". Anyone telling you different is delusional. SWTOR's 90 percent of quests are like this, and Tera is 100%. But, what these games do is offer you that same old grind in two different flavors.
SWTOR tries to make you care about "killing x" by offering a story wrapped around it, with voice overs to add to the immersion. Even though the quest is still "kill x", you would, supposedly, want to do it because you want to see how the story unfolds. In my opinion, this is mostly true for the unique class quest storylines. However, the side quests I found to be quite repetitive after the first few worlds. They all boil down to the same basic plots (i.e. "mean guys did something mean to me, kill them", "I'm too lazy or scared to go fetch this, you do it").
Tera's quests are a simple excuse to grind. That's it. But while SWTOR gives you "story" slapped on them, Tera gives you combat. Here's the thing, I didn't read quest text, I didn't watch cutscenes; I didn't care about them. BUT, the combat is fun; it's refreshing. The combat is what makes Tera different. I cannot say how it'll be in the future at higher levels, but as of right now Tera makes me want to do the quests because I want to kill mobs; and I want to kill mobs because I want to keep experiencing the combat.
Both these games are more similar than most would believe; they are both themepark grinds. But they offer that grind in different platters.