I wouldn't go with any of them, as there has been no definite proof (AKA creator's comments) as to whom she likes. Also, she has shown proof of liking both, but since she has known all of them since pretty much infancy or childhood, she probably feels comfortable doing what she did in the Pterosaur Legends.
Also, in the first series, all her crushes were on famous stars, and didn't show any relationship with either Max or Rex. Also, there was barely any time different between Rex's departure and Rex's return, because even though Rex spent time with his family, he returned right at the time he left, so I highly doubt Zoe had any time to gain a crush on Max in Rex's leave.
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it depends on which person you are if your max you get chomp and if your rex you get ace
Possibly, but I hope not. She did get irritated when Rex and Max had a crush on Zara, but this could (and seemed to be) mostly aimed at Max. Plus she cried when Max sunk in quicksand.
Most likely yes. BUT that doesn't necessarily mean Zoe returns the crush. She seems to like Max more. But hopefully in the future their are girls for him.
It hasn't been comfirmed yet but it is (hopefully) Max. And it is most likely Max after all the romance clues.
Yes. In the episode Metal Imbalance he, Zoe and there teacher Michelle get tied up.