I am often trapping in several feet of snow, so I guess that qualifies as deep, deep snow.
Honestly once you start setting on snow rather than in the dirt under the snow all that matters is how much is over the trap. Which is where the big jawspread really helps. Early season, dirt trapping that big jawspread is unnecessary, and I have some smaller traps that work just fine then, but I prefer when buying new traps now to buy ones I can use all year rather than having to buy two sets, one for early season and one for later season. I've had issues with freezing on MB750 and 650 traps with the plethora of moving parts, particularly on the bottom of the trap, so I am leery of a trap with lots of underpan, close fitting moving parts. I do believe the Harris has more powerful springs, which is very helpful in coming up through the crust.