For me, on line demos are too hard to discern differences. Besides, voices are not, for me, the sole choice.

If I were choosing between the PA 4X and whatever Tyros existed at the time, these are some of the things I would look at:

Size/portability. The PA 4X ,although a bit heavier, doesn't appear to be any bigger than my S970 if I'm reading the spec's correctly.

Controls: ability to manipulate voices/styles on the fly.

On board memory

Ability to set up and organize songs for gigs..ability to find those special styles and voices for songs.

How rich are the choices to upgrade voices and styles? How much and what type of support exists.

Bang for the $$$$ of course.

These are a few of the criteria I would look at.