I had some idea similar to this. I wanted them to make Omniverse with UAF style
If you're talking about the first ten aliens for both of them I'd go with Ken Tennyson. If Waybig is included for Ben, then it's Ben
Ben 10 is the strongest superhero. Only Ash Ketchum can equal him. This can be funny but if Ash uses Arceus and Ben uses Alien X, all the other heroes would be demolished within seconds.
AMPFIBIAN! Ghostfreak is so weak.
Ultimate Alien is the worst. I LIKE REBOOT MORE THAN UA. UA IS THE WORST
OS and AF:
This fight will take days and days over, but in the end Diamondhead will bore Chromastone down by forever-reflecting his powers
@IamtheJerry01 - The young ben and young gwen also look ridiculous in OV
Not in order though, because its hard to put one. But definitely Alien X is first.
In fact Blitzwolfer