Guitar Tracks and GTPro - How similar?

Hey guys,
 
I have been a Home Studio 7 user for a bit, but recently purchased a V-Studio 20 to use a control surface. Much to my surprise, I just love the included Guitar Tracks software. I would use it, except I need to use VST instruments and prefer the higher bitrate recording. Do any of you have experience with both GT and GTPro? How similar are they?
 
Thanks!
Nick