Current jungle doesn't punish either of them.
Need the other jungle variants to be playable without pretty much auto-losing the mid/late game due to weaker itemization.
The jungle a LONG time a go was designed for three archetypes.
Ganker - Cleared only enough to keep pace, ganked a lot. (Signature champion: Jarvan IV)
Power Farmer - Cleared constantly, and invaded to steal camps, rarely ganked. (Signature champion: Shyvanna)
Control - Cleared, warded, and maintained map vision and buff control. (Signature champion: Nunu)
The Ganker beat the Power Farmer, who beat the Control, who beat the Ganker. Ganker's cleared slowly, lacked good sustain, but were impressive gankers. Power Farmer's were late game behemoths who could clear quickly and often invade for extra camps, they beat the Control. The Control kept his lanes safe and eyes on the other jungler. Control beat the ganker.
Currently, Power Farming is very weak, ganking is "okay" but Control is the primary jungling method now. For a while it was just "gank everything!" but Riot nerfed all those champions itemization and individually. This is why you see a Sightstone so frequently on the jungler.
TLDR: Sejuanni, Gragas, and Nunu are the best control junglers currently, with Sej + Gragas benefitting from the other two variants enough to push them into being the top tier junglers. Rek'sai is still good, but she's an early game Control variant while Sej and Gragas are late game, and while Rek'sai can sometimes play invade bully, she doesn't offer the kill pressure onto a Sej and Gragas that Lee Sin, Vi, Elise, Jarvan had on them.