I definitely don't see Evek allying himself with the Dominion. He would have been first in line to back Damar's resistance movement.
Evek's loyalty is to Cardassia, above all else.
Evek is a great character and I really wish that we had seen more of him in DS9.
I have often wondered what he was doing during the Dominion War. I can imagine that as a Cardassian Officer, he fought for Cardassia and The Dominion to start with but that he might have changed his mind and joined the resistance movement when he found out what obedience to The Dominion really meant.
There is not much information about Aman Evek and his activities during the Dominion war on neither Memory Alpha or Memory Beta. According to Memory Beta he survived the plasma storm in the Badlands when he was chasing Chakotay's ship (
Liberty or
Val Jean or whatever). After the Dominion War, he obviously toook part in Cardassian politics:
After the end of the Dominion War, Evek took a prominent role in the Directorate political group on Cardassia. In a meeting that Garak attended, Evek called Skrain Dukat a traitor, which elevated Evek's standing in Garak's eyes. (DS9 novel: A Stitch in Time)
As for Damar, I find him an interesting character.
When he first showed up, I found him rather arrogant and annoying. Then he became a puppet to The Dominion, his low point was the brutal murder of Tora Ziyal.
But then he realized that he served a power which only wanted cardassia as a puppet state and nothing more so he started to fight The Dominion and died like a hero. A lot of interesting twist and turns in that story actually. In fact, similar things happened in some countries in Eastern Europe when Communism fell, politicians who had served the system becamefreedom fighters instead. Some of them may have switched sides for having a chance to remain in power but some were actually honest in their actions.
As for Damar, I strongly disliked him from the start but I got more sympathy for him later on.