Chiefs/Saints would be kinda lame from a props perspective because both of those teams have very concentrated offenses as far as who they go to, thus making lines on their players is pretty easy for oddsmakers. And betting props a big part of SB. You haven't lived until Brandin Cooks gets a brutal concussion and you're thinking "Man, I'd really like the Pats to win and he is vital to that but my sheet looks pretty bad right now and I have under on his yards so umm, I'll take it"
Have Pats/Rams to win their conferences as well and don't plan on hedging either.