I'm a big fan of 4x games. It's what I play the most of any genre and why I need a pc for my entertainment needs, from master of orion, stellaris, endless space and civilisation. Wasn't fond of alpha centaurai as other 4x games let you play at your own pace and it had a story to tell. I've briefly played civ 1 & 2 and loved the colonisation spinoff. Civ 3 was my favourite for a long time. I loved how it's 2d so ran on my old laptop with an obscure graphics chip (I forget the brand. Silicon?) and it resolved the turns fast on the 1.8hz Intel chip. I really didn't pay attention to the hardware on that computer as I didn't make it my own.
My favourite civ has to be Carthage in civ 5 lead by Queen Dido. Always been fascinated by Carthage, Etrusca, Malta and the milesians. Carthage's free harbour is a boon and its why I always look for a coast when settling early game.
Plus being able to March through mountains always makes me think how badass Hamilcar must have been, and how different our modern world would be if Carthage had allied with Greek generals like Pyrrhus.