My main concern with PC based analysers and scopes is simply the coupling between device and the PC - you have more on the bench. They all likely use much the same devices - ADCs and FPGAs. If I was being snobby I'd suggest you get what you pay for, but so much depends on your use-case - if you're just looking at relative timing on a bunch of stepper drivers then you can get away with an awful lot less than if you're trying to measure phase-shift on a video filter, or a heart-beat on a 400Mhz microcontroller. I'd suggest the bench scopes will likely integrate more capability than handhelds and the mixed-signal LA/DSOs - but again, down to what you need. It's worth looking at the analogue front end (particularly the input levels - many handhelds/PC scopes are good for 0-10V sort of ranges.

A good PC scope is likely better than a bad bench scope, and vice-versa. Perhaps link a couple of examples and we'll tear them apart, or otherwise - I can't advise any particular models - my experience is just with the Rigol for home and damned-sight more expensive ones for work.