Snowman Survival has stronger player counts over longer periods of time whereas Colony Control has big drop-offs showing it would not do well as a permanent game.It really should be a permanent game mode. There are bunches of threads on this... (take a hint people like it) Its so frustrating seeing the silly snowman game come back, none of my friends like that game... and frankly its not very exciting at all, but we all love and adore Colony Control.... First no Ender now potentially no colony control... Not doing much for the players this year. And its frankly very disappointing.
If it's a choice between both games to come back at Winter, it's always Snowman Survival first as it has always performed better on both Bedrock/Java.
We want to iron out many of the issues that are attributed to this but currently do not have the resources or time to do so.