Originally Posted by atikovi
Well, if the shallow doesn't fit, you need a deep and I can't think of too many situations where a deep WONT fit but a shallow will, so get the deep first.
Ditto. All my impact sockets are deep walled.
The only case I can think of where it might matter is the crankshaft bolt on Honda balancers; supposedly a special thick wall socket is required, so as to maximum twist on that bolt. Kinda specialized though, for one particular situation.