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predators and engineers from the alien franchise.

feats from comics and movies can be used.

no prep. all out war. all equipment seen can be used.

which is the superior species?

Depending on the series, I do believe that the Yautja either commandeered Engineer technology or the Engineers gave it to them.

In a one on one physical brawl, no weaponry, the Engineers are like 2 feet taller and several hundred pounds heavier. But the Yautja are much more durable and have one of the most insane natural damage soaks out of a lot of beings. The engineer should be able to win in a difficult fight.

With weaponry, it would be a whole nother ball game. There are thousands year old elder yautja ( Dachande/Broken Tusk) that have breezed through hundreds of xenomorphs with nothing but wrist blades and a spear, Yautja like him would absolutely annihilate multiple engineers if decked out in full gear.

As far as all out war and technologies I don't know. Probably engineers

In a physical brawl, the Engineers stomp. One Engineer killed several Xenos with its bare hands(no weapons whatsoever), and contended very well with a Xeno Queen h2h:
https://i.imgur.com/rMRJbG8.jpg

http://www.killermovies.com/forums/showthread.php?s=&postid=16059301#post16059301

We also have an instance of an Engineer physically stomping the christ out of a Yautja(which was armed with it's plasma caster and wrist blades):
https://i.imgur.com/hepJiyz.jpg
https://i.imgur.com/hV59v5N.jpg
https://i.imgur.com/TZyYS8C.jpg
https://i.imgur.com/vaPo2OO.jpg
https://i.imgur.com/Ai8FDC9.jpg
https://i.imgur.com/3xg6Ume.jpg
https://i.imgur.com/8W7JtAd.jpg
*Note that the Engineer also soaked a point blank blast to the chest from the Yautja's plasma caster in the second scan.


With weaponry it's harder to say, mainly because the full extent of the Engineers' tech hasn't really been explored. They do have blasters that can vaporize several Xenos simultaneously, though:
https://i.imgur.com/ezdGeWN.jpg
https://i.imgur.com/OyQb7W0.jpg

They also have personal shields:
https://i.imgur.com/nEx9KK2.jpg

https://i.imgur.com/is0Sofm.jpg
https://i.imgur.com/KyTfkly.jpg


In an all-out war setting, the Engineers would absolutely rape. They could just dump a payload of black goo on the Yautja homeworld and wipe out the entire damn race in one fell swoop. /shrug

Well, kinda. The yautja live in clans spread throughout the galaxy on there ships. With various elders leading their own clans so Killing the homeworld wouldn't end the whole race but for all intents and purposes it would definitely net them the win.