Runes of Magic you can mix 3 classes now and has player housing and good quest tracking system open pvp realms but is dumb cuz high lvl just camp low lvls
{about 10 classes 2 races but can choose 3 classes tons of quest 0 grinding and fast lvling it has by far the most gear and weapon selection out of the 3}
Allods has ship (astral) combat and 2 factions = open world pvp vs opposite faction
{about 6 classes and 6 races all characters around your lvl will have same gear same weapon and look just like you lvling is slow after lvl 20}
PWI has flying mounts and HUGE playerbase open world pvp and guild battles and territory control as well as runs better on older computers
{about 8 classes and 6 races lvling is slow}
based on what your looking for I would suggest Runes of Magic
