[Killermoose]

I personally think it's always best to stick with one or the other- that way you can more effectively choose what targets they want to go for. Thunder hammers against gaurdsmen, for instance, are overkill, but lightning claws are pretty good. But Thunder Hammers kill vehicles and Carnifexs well, whereas lightning claws don't stand a chance. So if you stick with one type of weapon you can better define what their battlefield roll will be.