If I had the money, I'd give the Snap-on's a try just because I'm a tool geek.

As a pro wrench, presentation is a big part of the show you'll be putting on, and Snap-on is an "impressive" name to be brandishing.

That said, as a shop wrench I use Ace Professional wrenches. They have a nice feel, about like Craftsman. They're generally cheaper than Craftsman and also carry a lifetime replacement warranty. If something breaks I can go 1/4 mile away and get a free replacement (and the only time I've had to, when a construction helper trashed a ratchet, they did without question). The nearest Sears is 90 miles away and won't always honor their warranty.