Honestly, it depends on the mods and the accesibility of the modpack, If i have instant acces to AE2, its usually the one I use after the usual chests (If I have the crates from Actually Aditions, thats also a great start)
But latetly i´ve been using a lot the rf tools storage scanner, as the wireless tablet has infinite range (by default) and its not that expensive on power nor resources. Also in combination with crates and chests from iron chest mod, it get very overpowered ealry on, specially on expert-themed modpacks.
Since there is no autocrafting with the rf tool scanner, there is always the need to switch to AE2.
But most modpacks either have AE2 or Refined Storage, I just use the one i have access to.
An example of a different choise I made is on the Antimatter Chemistry modpack, where you were given a starter kit for both mods, but I selected refined storage, mainly because it was way more simple and consumed less energy. I never switched back to AE2 as I didnt find it useful.