Hi Chony,
I've had my SD1+ for 3 years, PSR1500 for 2 years & my PA800 is now 1 year old.
If I had to make a choice & keep only the one, it would be the PA800.
Only reason , my hobby (obsession)for many years has been working out how the style creation functions work on different types of keyboards. Not that MY styles are actually any good (haahaa) .
Unfortunately creating a good style requires musical ability as well as knowing which functions & buttons to press.
Unfortunately I lucked out on the musical side.

Currently for me the Korg has the best style creation/editing functions out of the 3 keyboards I currently own. Haven't owned a Roland in the last 5 years, so can't make a comparison.

Some of the sounds (to my ears ) are definately better on the SD1+ than on my PA800. The "live drums" & the ability to incorporate a wav drum audio loop into a style is what drew me to the sd1+ in the first place. A function I'd never come across before in any other of my keyboards.
I'd luv an explantion on what Live Drums actually are??
I came up with this theory after I played around with the Groove function on the PA800. I tend to think a Live Drum is a rom based, sliced , audio loop ie you have your audio component ( drum loop) & your midi component (style track). Because of the midi side of things you can actually use the same Live Drum set & create different drum patterns based on the one Live Drum set.

Also, SD1+ uses 2 drum tracks, a "Live Drum " track as well as a normal midi drum track. The midi drum track also helps vary the drum patterns in a style.
Unfortunately the wav drum loop files loaded by users don't work the same way. The drum loop will time stretch so it can be used at different tempo's, but, it will only play back as is.

On the other hand, don't know if you've actually used the "groove" function in your PA2X? the Korg actually time slices a drum wav loop, so you end up with your audio & midi data. Depending on the loop you've used, you can manipulate the midi data & come up with slightly different drum patterns based on a single loop.
My PA800 is limited to 64 mb's, wheras the PA2X can be upgraded to to 256mb's. I've had to keep my loops down to a minimum. I've created a few brush swish grooves, mainly because they sound better than midi brush swishes. Also I share any styles I create,& trying to share audio can cause hassles.

best wishes
Rikki

best wishes