Elites have energy shields. Rechargeable energy shields.
And, if we take anything from Halo Reach, Elites have some heightened healing factor compared to humans (remember their health regenerated slowly). Predators carry field med kits to patch themselves up nicely so they can continue the hunt. But their armor is much less advanced than Sangheili armor.
Both races have plasma projectile weaponry, but only Elites have plasma swords.
The Elites have vehicles in which they can bring into battle.
I vote Elites.
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Predators have plasma forged blades with a an exterior made from a meteorite. They have vehicles as well. Just read some other responses, this is probably the most even match up of any poll on here