I did a lot of research last year on this, and came up with many opinions. Most would say the best gun is the one that fits you the best, and is the most comfortable to shoot.
I bought a cheaper "Yildiz" last year and it is very lightweight and easy to carry. I shoot sporting clays most of the time, and those light loads are all my shoulder can handle with this gun. If I was going to do it all over again, I would buy a heavier gun to reduce the recoil for all the shots I may do in a day. The recoil on these lightweight guns are next to impossible for most people to handle in the field, with 3" or larger shells.
If you plan to shoot a thousand shots/year like I hope to, then don't cheap out on an o/u. From what I have seen the Stoegers, Baikals, Yildiz, etc may not hold up to high shot volumes year after year. For occassional birds, ducks, and geese a Baikal may not cause any problems, just make sure it isn't too light!