They are all very different.
Rolex to me is something of the past. The designs are very traditional and classic... if you like that, buy one. I personally think Rolex is played out. They are small Millimeter case diameters and their designs command no presence. Plain Jane old style lawyer and CPA watches.
Tag is very hit or miss. Again, i will not wear a watch under 44mm in case diameter so i am almost as limited as i would be with a Rolex. Tag does make some cool stuff though. The new Grand Carrera is super sharp in any of its multiple styles... Then again, the cool grand carreras are about 5500.00 at an Autherized dealer so i believe a better watch can be had.
Breitling... Ah Breitling.... I think you all know where i stand with Breitling. Do yourself a favor and enter the world of Breitling, you will be glad you did. Big diameters, daring style delivered in a neo-classic pilot and nautical motif.
I will tell you one thing, its obvious to me what you are concerned with brand names (we all are at first, heck, i own a breitling) but i challenge you to jump on a watch forum and learn about what else is out there...
Check these brands out:
IWC
Zenith
Corum
Doxa
Anonimo
Ball
Ernst BenZ
Bathys
Maurice Lacroix
You might be impressed by these brands... although your friends might not.... Then again, some people i meet/know compare my Breitling to Burberry and Coach watches....
I would look at a watch with Valjoux 7750 movement, i think its top notch and would reccomend it!