And secondly... While the guitar voices in the Roland's ARE quite good, if these are the most important sounds to you (especially for use in styles, rather than playing live), I think you need to look at the Yamaha's.
Those Mega voices, in style mode, provide a degree of realism that Roland can't quite match. Roland's drums (IMO) are better, but Y's guitars rock!
It's a shame ONE manufacturer can't get it all right!
An arranger is just a tool. What matters is what you build with it..!