In my opinion, I would like to see both removed.
Mainly Freeze, though, since I can only choose one.
Freeze is just plain boring. I did not like Breeze from the start, and so sure, I liked Freeze a little at the start because it was new and I wanted to find chests and stuff and see what was new, but when it comes to it, it's quite unoriginal.
The ice chases take forever, and then you hit someone and off they go way in front of you and it's back to the start.
As someone said in an earlier post, a lot of the vines are cut off. This makes it impossible to get to a treasure, and it also means that I have an extra chance of being killed at the bottom or while on the vine.
Demons is very laggy. And I won't turn off my volume since it is extremely hard for me to play mcsg without it. I mean, how will I know if someone's behind me or if someone is breaking grass or leaves? This reason for keeping my volume on has saved my life more than once.
But with that, Demons is also original, unlike Freeze. Demons has lava, which I must admit, is a pain when you are lagging. The gameplay actually isn't any more fun for me than other arenas, when it comes to Demons.
In my time while playing it, a Livegame session will normally last 10 minutes or less. I find that the same with Solar Frost.
So in that case, I don't exactly have anything good unless I was lucky enough to find a tier-two chest, or a stone sword in a tier-one chest.
This is just my opinion, but if there is a possibility of removed both, I would do it if I were you.
I am definitely not fond of maps with lava, since it can mean an easy death so the person coming at you does not earn the points. Also since it makes the game much laggier and just not as fun.