Nuby rapid cool or prep machine?

[JLH2B26]

So I’m going to buy either or in the next few days and just want peoples advice on what they used? How do I safely do the hot shot method with a rapid cool like how much hot water say on a 4oz bottle would I keep for the hot shot?

I dont know about the Nuby rapid cool, however when i worked at a nursery, we always used the tommee tippee perfect prep machine, its fantastic and does everything for you in such a short amount of time! Ive gone on to buy my own for my own baby and im so excited for it to make my life easier with a new born!