I'd say the Imga are more likely, since they are actually located on Tamriel. If TES:V was set in the Summerset Isles then the chances of seeing Maormer would be more likely.
Edit: But personally. this.
If it was in Valenwood, it would be 100% =p
but ya, they seem like creatures more accustomed to temperate climate instead of the frozen wastes. The oceans would even be cold there
so I don't know how the others would respond.