The Kinks without a shadow of a doubt.
I could never get into The Rolling Stones, whereas I really love The Kinks. I admit Brian Jones, Mick Taylor and Nicky Hopkins are/were all great musicians and the Glimmer Twins' songs are admired by almost everybody. But I am not aware of a weak song or performance in The Kinks' catalgue, and while The Kinks Are the Village Green Preservation Society is deservedly acclaimed as a masterpiece, which will never appear dated, later albums like Give the People What They Want and UK Jive are underrated works of art. I hear very few hard rock bands bands, if any, that that do not contain elements of The Kinks. They also influenced many progresive rock bands too. Added to this is a whole string of hit singles that are household tunes in the UK, and outstanding live shows (in small clubs). Ray Davies is still writing melodic songs with barely concealed political attacks on our obnoxious politicians and bankers, but sadly it's all rap and boy/girl bands now. With The Rolling stones continuing to perform live, it's about time The Kinks reformed and made another album.