Ola is well known for making all amps sound the same. So the test is not easy. I took it kindof serious, but not on my mastering monitors, but just on my surround system (JBL + Samson Sub) and got it 100% correct! With one restriction, though: I could not hear a difference between Kemper and Mesa, so I wrote both in those 2 cases. Its really important to have the test *blind*. So our eyes cant betray our ears.
What I actually did was listening to the "warmth". A strange term, I know, but it worked. My order from cold to warm is:
Helix -> Axe -> Bias -> Kemper/Mesa
Having said that: When dialed in correctly I would not hesitate to use those candidates within a mix. Especially the Helix got much better than before, most probably due to excellent cabinet IRs. And in a mix I cant imagine to be able to hear which is which.
Do not destroy your chance for the blind test by clicking the results too early!