Dealer level scanners... without a doubt.
Tech 2, NGS, IDS, DRB
I use a MasterTech for most everything for quick code reads or mode 6 info. The MasterTech can do a lot, some programming and some air bag reset stuff. Nice scanner.
GM - ya gotta have a Tech 2 easy to read, easy to understand... sometimes hard to navigate thru the maze of info... but very, very good
NGS - a little dated, but easy to use. Good PID sections... wish it had a misfire graph like the Tech 2... I'll use the O2 PID along with the injector pulse readings to determine misfires.
IDS - expensive... nice, takes a little practice to work it... nice though
DRB - another dated machine... farely easy... Up to 05 it's effective... after that... sorry
I've looked at the Snap-on machines... sorry guys, not impressed. To many cords, clips, and small parts. The info is somewhat sketchy... on all models.
I guess the best way to put it is... The customer wants it fixed... they don't care how ya do it...as long as it's cheap. So if you have the wrong scanner or not enough info incorporated into that scanner... you're screwed...
I think of scanners like this.... They give you a rope, a tree, and a three legged horse... "You've got almost all the info you need, but some scanners will leave just that last little bit out... and sure enough that horse is going to hang ya... "
Taking a poll. Let me know your favorite scan tool or tools. Most of us work on just about what ever rolls thru the bay doors. That can be an issue.