They lost to St. Paul's earlier in year, who I believed tied with Rummel in jamboree. So I would guess Rummel is pretty close in talent.
St. Paul's was lucky to get Mandeville early in the season. Mandeville controlled the entire game; St. Paul's blocked a FG attempt from inside the 5 yard line as time expired in regulation, and got help from a pick 6 as well. In OT, Mandeville had the ball first, kicked a FG and St. Paul's fooled Mandeville on a play action pass on 1st down on their possession (set it up all game).
Point is, Mandeville was a different team early in the season. St. Paul's regressed while Mandeville improved. They have been picking up a lot of momentum with each victory and haven't lost since that St. Paul's game.
That being said, I think this is a dog fight. Both teams have stout defenses that really allow little room for error on the offensive side of the ball. Both QBs have incredible pocket presence and can find ways to extend plays. In the end, the team with better QB play wins this one, IMO.