Server choice

Hey, So I want to start playing hardcore. I’m EU realm and want to play a healer for dungeons - druid/paladin/shaman (undecided yet) The thing is I would like to try horde to get a different experience. But from what I heard alli is just much more populated… How are the EU realms in terms of population and faction percentage. I would prefer horde but not in a cost of struggling to get a group

Thanks