depends on the song...and the type of music you like.....if your playing a friggen song like Nights in white satin...your not going to jason becker the mother ****er and rip a blistering solo in it...your going to play it with emmotion...

but if your entertaining friends....and showing them "how good" you are...speed is where its at....

like that one guy said....you got to have em both :)
there is no right answer to that question cause its opinionated...but....

my two cents of advice would be FEELING.....:)

(cause thats all i have got :))