How does this work, termies only have one wound. It wouldn't even be all that good at protecting the equipment you want the most (as you might pick the sergeant with power weapon, the bolter + fist, the flamer [the three you don't care about], then the TH/SS and the missilepod [the two you do care about]. Now it's just random luck).
That aside; people have said it already. Normal marines TH/SS, maybe 1 in 5 have claws, to catch people off guard.
Most other codexes, mostly Claws and one or two hammers to protect you from walkers.
With Deathwing, mostly Claws and a fist with assault-cannon (adds shooting, and the fist does walker protection job).