Here is Aurora's website to give you complete descriptions on both cases... http://www.auroraarchery.com/html_eng/home.html
The Techno can fit 1 bow up to 43" A2A - comes with a shoulder strap and NO wheel system - comes in Red/Black and now Realtree camo
The Proline case (there are a few models) but top of the line can fit 2 bows with the divider system (sold separately) up to 43" A2A - comes with 3 way transport (wheels, shoulder and back pack straps) - comes in beige/black and now Realtree camo.
I personally have the top of the line Proline case and have transported 2 bows, Angel quiver, 2 - Sure Loc cases, stabilizers and arrows comfortably and safely. Never once had an issue at the airport or my equipment getting broken. Best reason I love it compared to the SKB case I use to own was this has the wheels and for a small person like myself, carrying a heavy case around the airport or shoot site can get quite cumbersome!
Good luck with your choice!