Currently, I play with long life span & 14 days seasons. I used to play with long life span/28 days seasons & also normal life span/14 days seasons. I never play with short life span or 7 days seasons, because it's too short & only few days to enjoy the changing of the seasons as well as the festival (I love festivals :D ).
After all the test & trial that I did with the life span & season, I feel that the long life span & 14 days seasons are the best combo, because, I would rather to spend some time with my Sims & taking them to skill up accordingly, have a balance life before they kick the bucket. On top of that, having the University is one of the reasons I decided to play with long life span because, I don't want my Sims to end up being an adult once they left the Uni.
For the seasons, 14 days is just a nice allocation where you can have festivals & just a normal day. 28 days is okay, but, it can be very harsh if your Sims live in Windenburg/Brindelton Bay. Both have a pros & cons. But I decided to use 14 days because I want my Sims to experience as many years as they can before again, kicking their buckets. :D
