does int or wis affect tradeskills here?

[Darwoth]

seem to recall one or the other did on live, is this the case here as well?

either via success or rate of skillgain?

[Uthgaard]

Yes. The skillups check the higher of the two, some special exceptions for other tradeskills as well. Smithing also has STR as an option, Make Poison also has dex, Fletching or Tailoring was dex as well, it's been too long.
Success is only determined by your skill level.

[Darwoth]

thanks