I wouldn't base my liking an arranger or not by how it plays legacy styles. First things first... how do the ROM styles float your boat? Bottom line is, if they are MUCH better than your legacy styles (at least as far as dynamics and detail), then you at least know you can tweak and convert older styles to sound like that, and Roland provide by far the best and easiest tools for that task.

And yes, I know it's a hair more convoluted how you load in new styles to try, but c'mon! Is that REALLY as important as how the basic thing sounds? I'll happily put up with all sorts of OS issues (and do!) if the darn thing sounds great.

The reason Yamaha's legacy styles play so well in them is that, to be honest, Yamaha don't really add very much new in each model. A few voices here, a few voices there, but much of it remains the same stuff they've had for the last two or three generations (not just models!).

And, at the other extreme, Roland seem determined to start almost from scratch with many of their arranger lines, sadly tossing out much of the good with the bad.

Heads you lose, tails you lose!