I've got Matco boxes but my most used tool carrier is my $80 AC Delco 2 tray open roll around. I do a lot of house calls and the thing has been worth its weight in gold. All of the big name boxes are nice, comes down to what you want to spend and what "status" you want to be seen as. I've got an assortment of every tool company there is. No question about it, Snap On Flank Drive wrenches are the best wrenches. I don't like Snap On ratchets. Truthfully my favorite ratchets are a couple of Great Neck push button deals. They have more catches than any of the others and are a nice, heavy build. A little bulky at the head. Best part is they are only like 15 bucks. I've got two and that is only because I thought I lost one. Had it since high school, works as well as ever. My favorite set of sockets is an S&K set. Were kind of high, but still cheaper than Snap On and Matco. The Snap On sockets have a thinner wall than most others and are still pretty bullet proof. The brand I've broken the most of are Craftsmen. I still have a ton of Craftsman tools and will continue to buy them. Cheap and warranty is no questions asked. Just inconvenient when they break because I have to go to Sears to have them replaced. I also have quite a bit of Blue Point stuff that has been nice. They are owned and made by Snap On but they are not made in the US. I have a few of their multimeters and some ratchet wrenches.
Edit- After you spend a while in the field you will notice the glamor techs. They spend more time wiping off their boxes than working on cars. My boxes are great, and I don't consider them abused, but they are absolutely well used and show it. They get dinged and scratched, just part of the game. Mine have also been relocated 5 times. Low end boxes are perfectly fine for most individuals but they don't last long when used in the field. Tools are heavy. Low end boxes have cheaper bearings and thinner metal while some have no bearings at all. On the cheap stuff the plastic wheels break, lower level panels dent and boxes contort all making it hard to open them. Right now there are thousands of great deals on nice boxes, some even loaded, due to the amount of techs out of work. I'd recommend buying used.