This really is all up to what game mode you want to play on and what your goals for that server is. Also, preference. For StarwarsRP, the Atmos might not be used because usually you are in a ship, so you cant see the day / night or weather anyway. My top 3 are the; Sit Anywhere Script 1 of the hundreds of ID addons Any playermodels.
I rarely see the Atmos used, but I feel like some Gamemodes are missing out on it! Atmos is pretty cool kinda laggy but cool. The sit anywhere script is of course wonderful.
For StarWarsRP @noxioustheyt I prefer Clone Card ID's that are TFA, great free addon.