Tech or Advance RLX and why?

My time to make a decision on the Sport Hybrid approaches.

I like the idea of a rear seat butt warmer for my son, and the additional driver tech of the Advance. Don't care about the Krell audio system, my audiophile days have been over since I transferred my music to iPod/iPhone. OTOH, could save a few bucks by sticking with Tech.

What say you?

Discuss.