It doesn't matter how many buttons there are, if you don't learn what they do...

Roland's have FOUR intros, FOUR endings, FOUR variations and SEVEN fills (and a break/mute)

Korg's have THREE intros Three endings FOUR Variations, and (to my mind, unacceptable) THREE fills (or more usually, TWO fills and a Break/Fill)

I'd shoot for making your mind up based on your playing impression rather than looking at specs, unless you take MUCH more care to read the specs carefully...

The Korg's have many great features, so does the Roland.