Loki Wave vs Nexus Sparta vs Nexus Revo

I’m moving on from the Helix and see a lot of talk about the Wave, I’m wondering if people have experience with the Sparta http://www.nexusrange.com/product/sparta or even the Revo, which got a raving review here: https://thebiggayreview.com/nexus-revo-stealth-prostate-massager/

Also Loki has the Hugo? Looking for your input to make a good decision, thank you 🙂