nuka-grenades and bottlecap mines are the best of their kind (bottlecap mines are probably the best anti-deathclaw weapon other than alien blaster/plasma rifles).

deathclaw gauntlet – ignores armor. All armor. Makes mincemeat of radscorpions and mirelurks. Way better than the shishkebab.

dartgun – cripples legs instantly. another excellent anti-deathclaw weapon (and anti-any melee, really). I can clear the deathclaw sanctuary with this, a hunting rifle or combat shotgun and 40 small guns skill.

can’t say I’ve played much with the railway rifle or rock-it launcher, though the latter does a lot of damage (but it’s really annoying how it handles ammo).