It's all about what you feel comfortable with and what tool does the work for you. When I started in the business, everybody used Snap-On. some Mac and very little Craftsman. Snap-On has become cheap (the broach of the wrench is thinner), and Matco has good tools and distribution. The Craftsman Professional series is close to what Snap-On made long ago. I compared a Snap-On and Matco Metric combiation wrench set for a year, and now have the Matco set at work and took the Snap-On set home. Then again I have a Great Matco dealer and a so-so Snap-On dealer, so that also has something to do with it. I don't like going to the mall and exchanging my wrenches when I need to - rather have the tools come to me (thus no Craftsman).
One of the other techs use Craftsman Pro series for all his wrenches - with no problems. Even his Gear Wrench type combiations are Craftsman Pros'. As far as ratchets go, almost everyone uses Snap-On, some use Matco. Again it's what you feel comfortable with, what you've seen break and how it's warrantied after the breakage.
As far as air tools, I still use a Snap-On IM-5 1/2" impact gun (gun was dicontinued 10 years ago), and a Matco 3/8" air ratchet for over 8 years with no problems (cleaned and oiled daily). I've had CP and Astro Pneumatic air tools that don't last a year. This is one area that a good, expensive name-brand tool seams to be worth the extra cost.
If you work on GM trim, you need a Posi-drive screwdriver. Guess what, Matco doesn't make one (only bits for 1/4" drivers), so you have to go to Snap-On for a #1 and #2 posi-drive. Always leave your options open on what brand of tool you want to buy.
Ask your toolmen if they have a set of loaner wrenches (and air tools) you can borrow for a week. If he does, it might give you a better idea of which wrench set / tools you want to buy. Good luck in the future .