The six is a rocket, easily comparable to an Accord V-6.
The four is a bit slow as compared to a 4 cyl Accord.
If you really care about fuel economy for the miles you'll drive the car, get the four.
If you want real grunt and aren't as concerned about fuel economy, go for the six.
If you want better fuel economy, go for a Honda Accord.
As BIU notes above, Subaru engines are fairly complicated for the power they deliver, and Subaru engines are among the few modern engines noted for head gasket failures in typical use.
Of course, that's been fixed, says Subaru, but it was also supposed to have been fixed by the time BIU bought his new Subaru.