I find maple to be alot more punchy and require less plucking force to bring out the twing and twang tones during high speed slap. I really love the sound of my pluck tones while muting(pups play a part also)over a maple neck, I really can hear a difference.
I can do the OHP (Open hammer pluck) exercises with a little less effort on my maple Marcus miller bass. I have a schecter C4 with a rose neck that I like the tone of, but it really sounds dead during the same exercises. So is maple better? I guess it depends on how harsh a punch, pop, plang, twing and twang you want while playing slap. I personally prefer the maple, but you may not.
Note: Each guitar is set up with the same brand and series of strings, obviously the electronics are completely different.