I use the ones that make sense for certain lots, such as Wild Foxes if near a forest, Bracing breezes on the Windenburg island, Filthy for more run-down places. Basically I try to give lots a unique feel, and I only use most of the lot traits for community lots. For residential lots though, I always use Simple Living and Reduce and Recycle, as well as Maintenance Troubles and Mold (still deciding if these are too intrusive for every lot - I had to turn off Mold for a family of 6 sharing one bathroom because they were all dazed all the time lol). Also I use Good Schools for families that would send their kids to private school.