As a jungler, who is more viable? Diana or Rek'Sai?

Never liked talking about "meta" but here goes.

Rek'sai is considered a stronger jungler due to her ability to detect moving targets. She's great at getting to her buffs, moving around the map, and ganking lanes along with the vision that tremor sense provides. She's also good at counter jungling for the exact same reasons I just listed.

Diana isn't as strong as top tier reksai but she still has her strengths. Her clear is good due to her passive and her shield but she's not as strong of a ganker as reksai. Diana needs a easy gank target or an ally with good cc to gank before 6, afterwards her gank potential becomes really good but it's fairly reliant on landing her q. If her q does land she gets two gap closers which let's her stick to her opponent.

Rek'sai is the stronger pick but she's more advanced. Counter jungling is difficult if you're not used to when to do it. As far as I've seen, reksai falls off late game (someone tell me if I'm wrong) where as Diana scales really well later on. She is essentially an akali with tankyness and can burst down targets on her own and still 1v1 very well. Most people just play diana mid instead but if you need an AP jungler diana is a good pick.

Edit: forgot to mention Reksai also has good sustain and clear speed. She's basically everything you'd probably ever want in a jungler.

Rek'sai is one of the safest, strongest picks you can take for the jungle. Get cinderhulk + black cleaver + all tank, and she has all the damage and survivability she needs. She has great clear, mobility, gank pressure, and teamfight presence.

Diana isn't nearly as safe a pick as Reksai, but with the new Devourer enchant she is pretty broken. Seriously, if you jungle as her, don't get Runeglaive- abuse that new devourer until they nerf it. Right now, Diana might be stronger because of the broken item, but all other things considered, Rek'sai is the stronger, safer pick