Comfort is relative and subjective...suggest you drive both and see what matters for you.
Tires also make a difference - I noticed a big difference switching from the 19" Mich Diamaris to 19" Hankook A/S.
Some opins if you use the 'Search' tab for 'sport suspension'
http://www.xoutpost.com/bmw-sav-foru...-question.html
http://www.xoutpost.com/bmw-sav-foru...-question.html
http://www.xoutpost.com/bmw-sav-foru...y-springs.html