players usually think its the best when they hear the word top lol
I would say privategameservers.com is better SEO wise since it contains all of your target keywords, while the other one doesn't have the word "game" in it.
people will search those keywords, not "top game private servers" or they might search "top (name of the game) private servers"
I mean, top private servers could mean private hosting servers, or something else as well. They are not necessarily connected to games in any way.
So take the second one.