The 4.5ARs are the goldy lock rims that strike a balance between aero dynamic gains, stability in cross winds, weight and accepting wide tires. In practice, I think the larger yaw angles will play a significant role, because winds rarely come head on and are rarely laminar.
Of course, aesthetics will also play a role, although personally, I really dig larger aero wheels. Tastes may vary, of course 
But if you want to save every watt, then going deep is the answer ā¦ choices, oh choices 
In either case, if these are your choices I donāt think there is any way to go wrong here, Enve rims are top notch, light, aero, beautiful, the only downside I can think of is the price tag.