He's asking which flashback was more effective, not better looking or from a much better movie.
I think the avp one was a better use of exposition than the one in Covenant. Actually thinking about it for a second, I wouldn't mind watching that movie. A movie set in Mayan times could be cool. The ending where they blew themselves up could also be written a little more heroic to explain away the already know finale. I mean that Predator did look like he was at least trying to look badass right before the explosion.