Hi,
Salute to your nice tank!! Few things to look at when choosing aros :
1. Coloration
2. Barbels
3. Eyes
4. The way it swims
5. Aggresiveness
6. No torn fins
7. Healthy - spread tail, swims around, active, etc
I see that the 2nd pic from top ie,the emerald xb, the Right Eye is going to develope "Down Eye".
and also the Sapphire ghxb 3rd pic from bottom, the Left Eye also is going to get "Down Eye".
Always compare and see both eyes left and right alignment thr same.
When buying aro, NEVER rush in, there's always a better one will come. It is a bit heart broken to see such a nice aro with a down eye problem later.
Wait...observed carefully, find a perfect aro, fully satisfied, then buy so that it's worth yr money buying an expensive aro.
All the best.