I'm curious as to why you think so?
Obviously the OP has differing reasons for starting the thread, but I believe the "topic" is very intriguing.
Dallas lost a considerable amount on defense, for better or for worse is yet to be seen. They also lost a decent contributor on offense in Cobb, and the "ramifications" of Fredbeards retirement are currently unknown. They brought in an almost entirely new coaching staff, added a few pieces to the D, and obviously have the draft+FA afterwards.
I'm not going to even pretend to act like I know what Tampa has done outside of TB12 and Gronk, but I do know they were a few wINTston mistakes away from the playoffs. They also have the draft+FA to look forward to.
On paper, just between the two, you'd have to lean more towards Tampa. Not even bringing in the Conferences each play in, because I believe one could make a case that they're even-ish..though NO is still a powerhouse.