Mobile Tools or Media Queries? I have always used CSS media queries on past sites for a responsive layout. Recently bumped into Drupal Mobile Tools dev.7 and liking it thus far. Trying to understand the purpose of it besides another method for a mobile site. 

CSS Media Queries: Great if desktop / mobile sites are similar in functionality. Easy.

Drupal Mobile Tools: Need to load a different theme for major desktop/mobile site differences. Contextual layout. Exportable configurations.

Mainly looking for what is best practice out there. Can too many media queries put a major strain on a website with tons of hits or is Mobile Tools bit of overkill for any small/media site? 

Thanks.
What about using Adaptive Theme or sky (based off the first)? These are designed with multiple screen sizes in mind and you have a community of folks to share knowledge with.