Hi peeps!
I reckon alot depends on personal preference & what you're doing with the Heli.
In the Navy & on the North Sea, wheels were essential! Some of my deck landings would have resulted in a very bad back if I'd had skids!
I now fly Police & have to say that I believe skids are the way to go! Alot of the landings we do are no-where near a prepared surface, as such I like the fact that the skids instantly transmit (through me seat) what's happening underneath.
I'm no boffin, so I don't know the facts & figures but I've never sunk yet with skids but have sunk with wheels. I accept the arguement about bear feet (thingies) on wheels alleviating that problem, but then they're hanging down creating drag etc anyway.
But hey, each to their own!