I like to own multiple sets of speakers, and change my set up once in a while. It makes listening to my catalog of music more fun. For example, I played a song on my currently refurb'd (but not done) speakers and was blown away by how they sounded on one particular song. But other songs sounded worse than my old speakers. I know my music somewhat well, and enjoy hearing the differences in various speakers and set ups. I wouldn't define it as "better", maybe just different... I like synth based music (but have an extremely diverse and eclectic collection), so I have to have clean, bass and midbass.
I have found room effects the quality of the sound more than the speakers by themselves. The first time I sound deadened a basement I was living in, it blew my mind. It was eery and creepy how the sound stage was after I was done.
Yes, I believe some types of music sound better on certain types of speakers. But then, if the engineers mixing the recording used the same room and system I have, maybe I wouldn't notice the differences in music so much?

I would rather have a system a crappy style of song sounds good on, than a crappy system that can only play classical, or only hip-hop, yo....
P.S. I had a car with a 15" inch sealed sub, 8" midbasses, 5.25" mids with 1.5" tweet with huge caps on the crossover and 1200 watts RMS total in the system. I had no rattles in the car, and I had everything set to be rather balanced (not too bass heavy for rap) and everyone complained that my car was not loud enough. How can a single 10" speaker with 150 watts be lounder than my car? Oh, yeah... No rattles

It sounded good to me, that's all that matters, right? Thankfully, some friends into SQ got into my car and were astounded. I didn't feel so stupid after that
One last entertaining note. The first car I put a big system was design for the best quality I could afford (with huge employee discount) and car limitations. My Mom was not happy to hear about what I had spent on the stuff. I was an adult and living on my own, but she didn't understand my logic. So, I said to her, "go grab your favorite CD and we'll go for a ride

What did she come back with? Yanni live at the acropolis. I sighed, and played it anyways. When the music came on her jaw dropped. She was in *gasp* Yanni heaven. When we got back she asked me to put a system like that in her car. I moved away before I had the chance, and I don't think she had room for the subs

So, if she could love Yanni in my system that also played Underworld and Diamond D... I am happy