While low/medium priority projectiles seem well understood… there doesn’t seem to be any hard and fast rules on super projectiles versus super projectiles. And definitely not all beam supers are the same (different startup before super freeze, startup after super freeze, and even travel time of beam supers are different!)
Trish’s Round Harvest seems to have the same amount of durability points as Dormammu’s Stalking Flare. (In training mode, it seems the two supers go through each other, and thereby reducing number of hits they do, so I had Dormammu teleport behind Trish to bring the Round Harvest back into the Stalking Flare, and they canceled each other out.)
Round Harvest also seems to beat both Akuma’s Gohado (fireball), and also stop Gohado (beam). Round Harvest also eat up other projectile supers too like Deadpool’s Happy Happy Trigger. Of course, instead of Round Harvest dealing 15~17 hits at full screen, the durability loss makes it do a lot less hits. Round Harvest gets nullified completely by Proton Canon… doesn’t even stop a single hit… very odd! Possibly Stalking Flare will suffer the same loss?
Akuma’s Gohado (fireball) seem to easily beat most fireball projectiles like Shuma Gorath Mystic Smash or Sentinel’s Hyper Sentinel Force. Actually, seems like super projectiles will clash predictably… Mystic Smash vs Mystic Smash and also Hyper Sentinel Force vs Hyper Sentinel Force will clash with each other.
Akuma’s Gohado (fireball) passes through most beam supers. i.e Gohado (fireball) projectiles will not stop Proton Cannon, and Akuma will be interrupted… but by the same token, Akuma’s projectiles will pass through and interrupt Iron Man. This is consistent with Hyper Sentinel Force, as we all know that those drones aren’t stopped by beam supers either. Possibly all projectile supers ignore beam supers?
Akuma’s Gohado (beam) will pass through most other beams. If you time it right, Gohado (beam) vs Gohado beam will trade and both Akumas will get hit once. Perhaps most beam supers pass through each other and will trade? Shinku Hadoken vs Shinku Hadoken (beam) will trade. Similarly, Gohado (beam) vs Shinku Hadoken will trade. Proton Canon and Shinku Hadoken also do not clash, and Iron Man and Ryu will trade 1 hit. Similar trade occurs for Proton Canon vs Modok’s Psionic Blast.
Oddly enough Proton Canon vs Proton Canon will clash and nullify each other. Also odd is that Akuma’s Gohado beam will also clash with Proton Canon, and Proton Canon hit Akuma for 29 or 34 hits out of 35. Note that Shinku Hadoken didn’t clash with Proton Canon.
Interestingly Storm’s Hail Storm is likely a beam super, as it doesn’t clash with itself. Storm vs Storm both doing Hail Storm will trade 17 hits with each other.
Magneto’s Shockwave seems to be multiple stationary projectiles. They don’t seem to block beam supers either.
Haven’t tested much with Phoenix Rage, but likely a beam super that clashes with Proton Canon.