re: AoW3 vs EL
They're both great
Get AoW3 if you enjoy tactical combat, get EL if you enjoy strategic empire management.
AoW3 has an almost insane variety of classes, races, spells, units, equipment, abilities, terrain, etc. It makes for tons of engaging tactical combat, and the combat AI is actually very solid!
EL meanwhile has a wonderfully unique fantasy world, lots of mechanically distinct factions, and some pretty smart TBS design. Combat is just ok, some basic tactical stuff. It still has all the problems endemic to TBS design as well though - marginal strategic AI, snowballing victory, etc, but if you don't care about that, it's fine.
So if you're more of a Civ fan, EL, but if XCOM and the like get you excited, go for AoW3. AoW3 does have strategic level empire stuff, it's just less fleshed out than EL since the focus is on combat.