Neither, honestly
I would use a different set and item for Feraligatr, which is below:
Feraligatr @Life Orb
Trait: Sheer Force
Adamant Nature
EVs: 252 Atk, 252 Spe, 4 Hp
- Earthquake; Much, much better than dig, and covers electric types more easily
- Waterfall; Keep it, it's really good
- Ice Punch; Covers Dragons and Grass types, plus really useful at times
- Dragon Dance; Start your engine and win the race
If Feraligatr has Sheer Force, Dragon Claw won't get a boost from it, which isn't good. Plus if you have Life Orb and Sheer Force, using Shadow Claw will get you LO damage. Sure Shadow Clawson covers Ghosts and Psychics, maybe, but that's it. Other pokes are good at that. Not Feraligatr. Dragon Claw is useless for this Gatr, since ice punch covers dragons and grass types, so don't use it.
Hopefully this answers your question
Hope I helped!(ish)