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Hey guys, i was wondering are Rending Claws any good against Vehicles?
and what is best to arm your Genestealers with? (Rending Claws or Scything Talons and Rending Claws)

This is more of a tactics question.
However, with a Strength 4 (which is what almost every model that can have RC is), your not really going to be taking out a whole lot of vehicles (would never get glancing on AV10's as you would either get 9 or less or 11 or more). Genestealers excel in taking out Infantry, where that To Wound roll of 6 ignores armor. At +2 pts getting to re-roll 1's in CC helps quite a bit, if I have the points I'll usually take it.
If your asking about Rending Claws in general,

If there are enough of them, very little can stand against a charging horde of Stealers, unless they are in cover of coarse.

I usually run a brood of 20 with just rending claws, outflanking onto objectives or harrassers, like artillery or HWS or Devastators variants. Even striking at Int 1, defeating 20 models with WS and Rending is no small feat and the types of targets they should be targetting are those mentioned above, small ones that would not be able to protect themselves.

As for ST, I wouldn't advise them. Sure, rerolling 1s are good, but they are goiung to be hitting most things on 3+ anyway, and if they are hitting on 4+ then they are fighting the wrong thing. They are good against vehicles, but in the vehcikle is moving it ain't firing, and if it isn't then you hit with a good number of attacks. Besides, pile on enough attacks and you will do damge so that you can destroy it next turn.

One thing i would say-Adrenal Glands. Better against vehicles, penning AV 11, never glancing, and giving a chance to glance those nasty Land Raiders and Monoliths. they work great against Infantry as well. Assuming there isn't cover, those Genestaelers will be hitting on Int 7, WS 6, and Str 5 rending. That ain't something to laugh at. Any Broodlords will be WS 7, Str 6 rending and Int 8, and his Psychic power Hypnotic Gaze can shut down hidden power fists and power weapons, as well as characters, untill the rest of the unit has been dealt with.