have had the hypercharger for over 4 years on my R*. Takes some getting use to as it does stick out, but it is cool and lots of options. I have the standard one. Lots of options with the standard. different trap doors/butterflies, can even put scenes/pictures on them. Different covers too. Check out the hyper streamliner, stinger trap door, infinity streamliner (I have this one & gold butterflies/trap door). I can change the look in a few minutes. You can even buy a pro upgrade kit for the standard to change things, though not sure how that will mess with your jetting.
Can't change up the pro-r. Plus the pro-r sticks out further. I'm happy with the hypercharger. You might get a few more hp
out of the pro-r, but doubt it'll be that considerable of a difference.