Gentle, polite sarcasm:
Sex can only be rated on a linear scale. Either someone is better than someone else or worse. Different is a given, therefore that can not be evaluated. If you deviate from the line of good vs. bad, nobody will understand you.
Seriously, sex is like flowers in a flower shop. If you like daisies, great. Some like roses. Others like Carnations, etc. Anybody who likes any one of these flowers is not going to rate the other flowers as better or worse than a given pick. All flowers have value. Some are more fun on some days than others.
I've had sex with a number of women in my life. Some of them I miss, and wish I could have sex with them again. None of them make me enjoy sex with my wife less, nor could they replace my wife. Similarly, no matter how good the sex with my wife is, it doesn't change the fact that I enjoyed sex with these other women and I miss some of them.