Rather than just listing best and worst, let's look at what the life is like in different civilizations
Most likely to feed you - Elhoim
Most likely to feed on you - Calabim
Most likely to feed you to a pet - Swaltafar
Most likely to give you a pet (animal companion) - Lojafar
Most likely to make you a pet - Balseraph
Most likely to make you target practice for pet demon - Sheaim
Most likely to protect you from a pet demon - Bannor
Most likely to protect a pet demon from you - Amurites
Most likely to make you a mechanical slave - Luchirp
Most likely to make you a slave - Lanun (Under OO)
Most likely to sell you - Hippus
Most likely to sell you well crafted swords - Khazad
Most likely to kill you with swords - Doviello
Most likely to kill you with claws - Clan
Most likely to offer you a claw of friendship - Kuriotates
Most likely to offer you a flask of friendship - Malakim
Most likely to ignore you - Sidar
That should cover all of them.
As for actual answer, tree cities of elves sound nice, but humans would be out of place there, so I'd chose an Amurite university instead. The worst place to live as a regular person would be Calabim empire (where you are just cattle), and the worst place to live as a nobleman would be Balseraph empire (where important people are more likely to draw the attention of mad ruler).