i've botted 70-99 at the dungeneering dungeons, got about ~60k/h, and it's relative save (botting is never save, but it's not as obv. as botting at edge )
Id say barb fishing, its fast and even just dropping the fish if your not bothered about the cash, it can be done extremely fast. It is how i got my fishing to lvl99.
Personally I botted until 90 at shilo village fly fishing and then 90-99 at rocktails and made a decent profit/the xp/hr wasn't bad.
Id recommend botting shilo village fly fishing or otto's grotto heavy rod fishing. I recommend c2 dung floors if you're doing it legit because its basically the fastest(stay away from botting this because Jagex has been catching dung bots recently).