I've never bought into that cliche of it's tough to beat a team three times in a season. New Orleans beat Tampa Bay, 34-20, opening week and defeated the Buccaneers far worse in Tampa, 38-3, in Week 9 when Tom Brady was more in sync with his new team. Brady had a 2-to-5 touchdown-to-interception ratio in those losses to the Saints. 
Truth be told, Brady hasn't been that sharp when taking on strong defenses such as New Orleans. The Saints could have the hottest defense during the second half of the season. They've held seven of their last 10 foes to 16 points or fewer. New Orleans defense only had to be on the field for 21 minutes against the Bears last week. I like the Saints' defensive line, perhaps the deepest in the league, to win the battle of the trenches especially with the Buccaneers losing guard Alex Cappa to an ankle injury. Brady doesn't have the mobility to escape a strong pass rush, which the Saints can generate without blitzes. 
Tampa Bay is 2-5 SU and ATS against playoff teams. 
The Saints are the steadier team with a highly-efficient offense and the best playmaker on the field in Alvin Kamara. Drew Brees has his top wideouts healthy again, including Michael Thomas.
New Orleans has home-field, far more postseason experience than Tampa Bay and the built-in confidence of two previous lopsided victories.