#1 is easy... whatever arranger each one of us personally plays. Who on earth would buy an arranger that they DIDN'T think had the best on board styles?

#2 is harder. It depends on WHAT third party styles you needed... (if the internal styles didn't already cover what you need - negating the need for #2 )

Why not add fuel to the fire... how about some topics like

Who is the best player here?
Who has the best PA?
Who has the best gig?
Who prefers to use style mode ONLY?
Who doesn't like to have anyone here listen to their music?

That ought to keep us occupied for a while...