Welsh, Irish Gaelic or Scottish Gaelic?

Which should I learn, and which is the easiest for a native English speaker to learn?

All three are ugly languages, Learn something without /x/ and weird morphophonological alternations. Something nice, like Aymara, or Tsonga.

I apologize, Aymara indeed seems to contain the velar fricative. Tsonga may as well, so disregard that advice.  Learn Quechua or Swazi. They're both without /x/ or /χ/.