I noticed something I never saw before, but in the DC/Marvel crossover, there's actually a small art piece showing Darkseid and Thanos matching eye beam for eye beam, neither having any advantage. Their fight is mostly off panel but throughout the series, it was unquestionably implied that their fight was more than just some brief encounter. People point out that Orion's loss to Surfer carries weight because it represents an author's (John Byrne's) interpretation of how the fight would really happen despite not being canon, yet we see here that the same logic points to Darkseid and Thanos being evenly matched.
I don't know why people point out Orion's loss to Surfer, are they willing to accept the logical consequences?
Well, Darkseid blasts Thor and we see Thor immediately up and ready to rejoin the fight. When we see Thanos blast Thor in Infinity #6, Thor is out for 10 pages.