umm if u would rather be afk or in another window just do soul wars
but if you there try experiements (more for lower levels i guess.) or ankous (spelled right idk) or anything really in stronghold of security..
another good place is in the stronhold of player safety.. on either the cockroach soldiers or the lvl 50's.
none of those are even remotely close to best. i get 110k attack xp an hour at armored zombies! bandits is like 70-80k at best lmao. look it up on google then tell me bandits are the best!
I prefer soul wars, you can afk through it and still get a good amount of exp. Or you can fight and get a full 4 exp per 1 on the slimes (55 slayer) or the pyrefiends (30 slayer)