Personally, I like the Poseidon emblem. Not sure which one it is. I think sixth or seventh.
Given I have an Aquaman Emblem, I stayed at Prestige 6 for a while. I tried unlocking the Tri-Bolt Calling Card (since it looked like a trident), but I'm garbage with the Tri-Bolt crossbow, worse without Tri-Bolt.
I prestiged a few more times (on 9 now), and was a bit upset I didn't reach my goal. Thanks to the latest update, I have a Calling Card with the underwater stuff and the trident and the octopus arms... So perfect.
"Gary was here. Ash is a loser!" = Greatest Tramp Stamp Ever