What is your favorite Template Framework and why?

Hey guys, this is an odd question to ask here, but as I truly believe that Stackideas is the best Joomla related community and I truly value the opinions of everyone here, I thought I would ask the following question.

As of late I have noticed that the template framework market is getting saturated with Gantry, T3, Helix, Warp, Gavern, Zen Grid, ZO2, Construct, JV, Wright, YouGrids, OS (OrdaSoft) just to mention a few...

Recently I noticed that Mark and a few of members here on the forum have been focusing a lot on improving performance and page load speed....

What I wanted to ask is, what is your favorite Template Framework and why?
Which do you feel is the fastest Template Framework?
Which do you feel is the most feature rich Template Framework?
Which do you feel has the cleanest code and complies best with modern web standards?
etc.

Everyone who has an opinion please share.

Thanks a lot in advance for all your input.