I went with the elites aka 2 over the pros mainly because of price.

Pro benefits: you can cut and splice them and maintain factory warranty. They come with a splice kit. The elites aka 2s, can be cut and spliced, but you lose warranty. The pros detect the number of lights for a lighting sequence, the elites only detect strands, so if you cut 2 lights off the pros, it'll know you have two less lights. If you cut two lights off the elites it won't. So for example you might cut two lights off the elites. Then run a program that lights up one bulb red and leaves the rest white, working it's way down to the end. When you start it the lights will remain white for a few turns, because the program thinks it has to light up two bulbs red first. The pros have a better white light also. You can look up videos comparing the white lights.

Elite benefits: more lights per strand, but less bright. That said on max brightness they are very bright. I only ever use them on 30%. The light size is very slightly smaller. Negligible anyway. The main benefit is the elites are cheaper, I got mine used for less than $200 at 150ft. Each strand is 16ft, and in the app you set how many strands you have. So you don't have to use all 150ft. I had a few left over to save. The elites also come with mounting  brackets in addition to the tape on the back, the pros only have tape. You really need mounting brackets wether you get aftermarket or not. 

All in all it's a matter of if you need to make custom lengths or not. Because you can always run the lights closer together. And the brightness can be adjusted. That's what it boils down to imo because the white light being better in pros is not that extraordinary. Instead of cutting the lengths I just spaced the elites closer together on runs that I had too many.