One thing about DB speed that always threw me for a loop. People say that the characters are gazillions of times FTL because of dodging ki blasts that are FTL etc. Yet we've seen Goku on numerous occasions, even in SSB, use a KAMEHAMEHA and then use instant TM to go in front of the blast for a surprise attack. Why not just straight up outspeed the blast without ITM? PIS? CIS? Me being pedantic? Hell how are they ever hit by ki blasts in the first place?
Prolly the latter but it's annoying lol.
Anyway my brief thoughts. If you slide DB characters over to Marvel/DC they would very likely be portrayed in the same league as the top tiers in those respective universes. Maybe slightly above when you add in UI etc. But with Marvel, I'd bet my paycheck they'd never portray Goku and co in the same league as cosmic beings or high end gods. I can't see DC doing it either, though they do have a history of giving some of their top tiers good showings against their gods given various amps and other plot devices.
However if you slide comic book characters into the DB verse the top tiers would've been left in the dust at around the android saga. Maybe even before then. But certainly before the Cell games imo.