circa 80s Centurion LeMans is my primary commuter. I voted #1, but it's not /that/ light, as it's steel, but it definitely falls into the "road bike" category.

I have a Xmart MTB (front suspended, hardtail) that I use for particularly off-days, or when hauling a trailer (currently off the road with a rear wheel problem).

Hands down prefer the roadie, I prefer working less to go faster.