I like avocados no matter how they're prepared, or if they're just sliced up in a salad.
I love them on a toasted sandwich with chicken, cheese and mayo.
Guacamole is good too. I never buy it though. I think bought stuff tastes like crap. I always make my own.
It's also good with seafood because the flavour is fairly mild.
When cooking with avo's you should always choose fruit that's half a day from fully ripe if you want it to keep shape. That's my only bit of advice.