Did you mean the Yellow and Red, or the Red and Green?
I started out with the Red one a few weeks ago. It's been hard to do it regularly and daily. I don't mean painfully hard, just hard to remember to do it all the time even when not feeling pain.
Most days my elbow is fine, however if I water or do anything physical without the brace, I am feeling it for the next few days.
It's interesting how slow of a recovery this injury is.
I gave one away to a buddy but I still have the green one which I believe is the larger of the two so it was probably the red and green combo.
I'm a bigger fit guy so if you're smaller or you don't lift, maybe the smallest two will work best? I do know I ordered the green one first and it was too much for my injury so I ordered the other one and worked up to the green one.
I suffered needlessly for a couple years with that pain, I really wish I'd known about these sooner.
Set a daily reminder on your phone or your PC for a couple weeks. After that the routine will be set and you're on your way to recovery.