The Stevens would probably be the safe choice. It has an adjustable trigger and a proven reputation in that it is actually the older Savage 110 action.
That said, I have two ATR's (.30-06 & .308) and a friend has a .243. Each has performed very well and will group with the best on the market. My buddy's .243 is about a year old and mine are four and three years old, respectively. Over time the triggers have worked in very well. My '06 trigger is about a light as I would want in a sporting rifle. My buddy does not hunt, so his rifles are range guns. His .243 trigger has worked into being VERY light.
The ATR's have a nice target style recessed crown and the barrel is a bit thicker at the muzzle than the Stevens. The ATR also comes with scope bases already mounted.
Given that the ATR is still available for $249 and the Stevens are becoming harder to find for under $300, the choice is tough. I stand by my original comment, however.
Just for the record, in addition to the two ATR's I also have five Stevens 200's. Not because I prefer the Stevens over the ATR, lately I've found some good deals at a local pawn shop on a couple of Stevens.
Personally, I prefer the feel of the Mossberg. It has a more weighty, solid feel than the Stevens. In my experience, one will not out shoot the other. Each is capable of consistent MOA, sometimes less. Not bad for a sporting rifle.
Good luck.
