You have to pick:

Darkspawn are gross.

Is there a Blight presently occurring?

Mass Effect universe? that would be pretty kool to work with Commander Shepard.

Depends whether it's Paragon Shepard or Renegade Shepard. I'd probably want to stay out of his or her way, myself.

As for the rest of the universe - a science fiction setting is usually a big plus for me, but it's looking like there's a science fiction armageddon coming in the near future there. So it's not quite an obvious choice.

Both settings are fraught with death and destruction. But in between massive world/universe threatening events a sci-fi world is just more comfortable and filled with cool advanced conveniences. They would both be quite dangerous from time to time, and you might get killed. So why not pick the one that's nicer in-between.

It's worth it to remember just how full of suck the Dragon Age universe is.

<Future with hundreds of aliens, and space travel.
>medieval time with monsters, dragons, and Magic.

Space FTW.

In the wake of Dragon Age 2 and Dragon Age Inquisition we've seen that there are worse things than Blights afoot in Thedas.:)