After all the different comments it's clear you can't argue about personal tasts, but there's one thing never mentionned so far!

A lot of the likes or dislikes could have something to do with the playing technique!

To get expressive sounds from a Roland(exception are the hammond simulations) you need to be able to make use of the aftertouch, where Roland excels in my opinion.
On the other hand this means that playing the board as a synth it will very often result in dull sounds.
Personally I never needed any volume pedal on the roland boards with aftertouch.
Hitting hard is hard.
Hitting soft is soft.

This is one of the reasons I do not feel comfortable on a Yamaha (also the keys are too small on a yamaha).
It's allways hard for me on a yamaha , I cannot play soft/mellow on these boards.
It seems that unweighted keyplayers prefer Yamaha and from origin piano players prefer Roland?

Interesting to find out...