Here's my personal ranking the trilobites in this match (keep in mind that this is only my personal opinion and you shouldn't have to copy my takes)
1. Ceratarges - This trilobite was suggested by Savage Almond, and it as a pretty interesting appearance with the trailing spines and the eyes on stalks. Pretty cool trilobite, so it gets my vote.
2. Olenellus - This trilobite was suggested by Ankysareawesome. It's a pretty important trilobite since it's an index fossil for the early Cambrian.
3. Cheriopyge - This trilobite was around at the end of the Permain, and it looks fairly interesting by the standards of trilobites from that time given the shape of its head and pygidium.
4. Kettneraspis - Another trilobite suggested by Ankysareawesome. It looks kinda neat, but it doesn't give me much to talk about.