Depending on what version of Prometheus you're going with, they both have some unique attributes to them.
Wikipedia said
Curt Calhoun, the original Prometheus, possesses a metal epidermis, which confers superior strength and durability. Calhoun is also capable of raising the temperature of his armored form to several hundred degrees Celsius.
If I understand that correctly, Calhoun would have Colossus like abilities.
Wikipedia said
The second Prometheus possesses no superhuman abilities, but like the hero Batman has undergone intense physical and mental training and utilizes an extensive range of equipment and technology. Common tools include body armor; gauntlets that fire various projectiles; a tonfa with several technological features; and a helmet that in addition to emitting strobe lighting capable of disorientation and hypnotism, can via a compact disc allow a download of the knowledge and physical skills of others directly into his brain, his default disc including the skills of thirty of the world's greatest martial artists. Where Prometheus obtains this information is not known, but his combat skills include the duplicated abilities of Batman and Lady Shiva, although it is unclear how much combat training he would possess if he had to fight without the helmet. The 'battlesuit'/helmet combination is also equipped with an Artificial Intelligence that can rapidly calculate and deploy a variety of strategies and countermeasures that have allowed Prometheus at various times to incapacitate entire groups of Justice Leaguers singlehandedly and simultaneously. Finally, the second Prometheus possesses the "Ghost Key," which allows the villain to teleport himself and other objects and persons to and from a dimension called the "Ghost Zone." It can also be used to inflict total molecular disintegration on a target, but Prometheus only employed this function once, when he eliminated an unsuspecting Retro.
So we have someone who can learn anyone martial arts skills and knowledge, hypnotize others, has an AI which makes him a master strategist and can teleport. He's a real buzzkill for any other player to RP with.
Wikipedia said
The third Prometheus relies on the use of two pistols, although he also possesses his mentor's helmet and artificial skills, giving him the training to defeat even Lady Shiva in a matter of seconds.
This one isn't too bad, but he still has that bloody helmet.
Wrath on the other hand is trained similarly to Batman and uses firearms, he's much more like your Deathstroke if you want to expand the character library within your niche.