Okay, while power leveling some lower level pets I ran across a few tricks to help you identify if a pet is worth capturing. First, have another version of it. If you don’t already have one it’s worth capturing no matter what the quality is. If you want a higher quality pet (I aim for rare.) then first you’ll check stats of the one you have against the one you’re up against.
Notice the one I have is level 10 already, but as you’ll see I’m up against a level 9 with better stats.
It doesn’t look like much of a difference, but one level does make a difference, especially when the stats are that close together.
And as you can see, I got an uncommon pet out of it, and a new baseline to measure quality for a rarer version.