I'm doing both right now. I do country lessons in the early morning and blues in the early afternoon and split other stuff (scales, chord changes, finger flexibility, songs) between the two sessions.

I figured I had the time so I started both blues and country lessons around New Years. I wanted to do both...together they are pretty much native to America and together they are the seeds of rock and roll. The techniques from the two lesson tracks will transfer to other genres I have no doubt.

I'm getting a kick out of each and really like both Lisa and Anders. Their lessons are taking me where I never got to when I was a kid and it's frakin' fantastic!

So excuse my rambling non-answer...this GT site and its lessons are a whole lotta fun! And I can't answer the OP question about which is more enjoyable. :D