The Roland's have an EXCEPTIONAL drum sound, a massive selection of kits, and lots of very dynamic styles. But possibly its best feature is its Makeup Tools 'header editor' that is BY FAR the simplest way to not only change kits for a style, but also simple but powerful editing of the sounds within a kit.
They also include kits from Roland's 808, 909 and CR-78 years, along with a huge selection of ethnic kits and great percussion. Their style structure also allows for up to six fills, and four intro/endings. Their style structure main weakness is no actual break/fill, just a break. But if you're using MIDI PC's for division choice, it's easy to repurpose Intro1 (usually a count-in and pickup) as a break/fill.
You'll find that Roland's fills are generally MUCH smoother and more connected than Korg's are, imho.
Quite honestly, as a drum machine module with keyboard sounds, I think there is no equal ๐นโค๏ธ๐
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An arranger is just a tool. What matters is what you build with it..!