I've mentioned this in quite afew threads before, but I bought an Air at launch, then returned it for a Pro Platinum, which I'm very happy with. However, the image quality was significantly better on the Air. In saying that, since I'm just a hobbyist and the videos only go on youtube, the quality on the Pro Platinum does the job. Main benefits of the MP or MPP:
Noise - There is a HUGE different in noise levels between the Air and the Pro, not just how loud it is but the pitch, the MPP is much more pleasing and when using in touristy areas it is barely noticeable once at a certain distance/height. I found taking off and landing with the Air was very noisy and drew alot of unwanted attention.
Range - Occusync is significantly better in Urban areas (UK). If you plan to use the drone in wide open spaces, the Wifi on the Air will be fine
Battery - After being spoiled by 30 mins of flight time with the MPP, going back to 21 mins would be tough.
I think it all depends on how you want to use it - if you're planning to use it in areas where there might be alot of people & you don't want to draw as much attention or be worried about limited range should you be in city, but you don't mind sacrificing abit of image quality - get the MPP
If you are using it in wide open spaces with no worry about range, you don't care about noise level since there will be no one around, or if there is, you just don't care about drawing attention, and you want the very best image quality possible (from the mavic line that is) - get the Air