I prefer Parasite but due to the fact amazo usually has the powers of the big 7 JLA at least he probably takes it. Parasite would if the fight is drawn out because he also draims life force not just powers. Not sure if him momentum absorption power (like a mini speed steal) helps him vs amazo
Parasite: "I've got your experience, Mxy, remember? I stole that, too... And with my experienced five-dimensional mind, time and space are just building blocks, to be arranged in any way that makes me happy.": https://i.imgur.com/g8ncFyi.jpg
Parasite: "With powers like these, Mxy, you could've reassembled every atom in the universe, from the big bang to the end of time!": https://i.imgur.com/TCb8IBH.jpg
Parasite then used Mxy's power to warp the entire 3rd dimension in his own image...
Mxy: "My guess is that he used my powers to give the third dimension a fresh lick of paint."
Parasite: "Not just a paint job, squirt -- I've rebuilt everything to be a little more Parasite-friendly.": https://i.imgur.com/JTw2sRZ.jpg
__________________
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."