which speaker is better suited for Rock and Roll

Here we go again...

Speakers are not best for rock and roll without being best at classical, jazz and anything else, because all musicians are humans that have human hearing so they all use the same frequencies in the same way for expression. 

The speakers literally do not care what genre of music you play. Its all the same to them. 

I actually had somebody ask me once what speaker was best for downbeat 80s... When you focus on such a specific genre like this, it casts a vivid relief of what is really happening: speakers don’t care about rock or classical and no-one has ever figured a way to design them to do otherwise. 

Does the speaker play louder for rock? Great! Its good for high energy classical or whatnot as well. Same thing for bass, midrange, dynamics, etc.

I agree. Rock & Roll is very dynamics genre with a very strong emphasis in the midrange spectrum where most of the sound occurs. Any harmonics happens beyond the mid range gives that airy sound. We are more sensitive in this speectrum. I listen to Rock & roll too I find a house curve response to be ideally for this. 

I have a pair of Klipsch in my main room. I like them a lot with the amps I use them with.   

In my second system I have the excellent Studio Electric M4.   It's a great speaker.  I love them. If starting from scratch I would seriously consider the M4s big brother the M5.   I probably won't abandon DHT and low power tube amps anytime soon but I will own a pair of those in the future.  

I fully agree with Ralph.   A speaker should handle any genre.   The reason I sold my Omega is because they did not have a firm grip on everything you threw at them.   As great as they sounded at "normal" levels they fell apart at louder levels or even not so loud complex passages. 

You guys crack me up. I have Klipsch Cornwall IVs paired with a Luxman L-507Z integrated amp. It sounds amazing in any genre and plays ROCK at monster levels when asked. Was hilarious to see the list the guy posted leaving out Klipsch. Id put my system up against anything. Maybe get your noses out of the air and stop being such snobs. BWHAHAHA. Klipsch are excellent.