NW? lucky, what are you thinking? Just kidding!

I have been thinking about requesting a match with DL, because they have so many flights from TPA. I think they would be a better secondary airline than UA. However, considering that NW/DL will be the same airline anyway, it wouldn't matter which one gave the match, I guess. I would use my AA EXP. Does anyone have any thoughts as to whether it would be better to request the match from NW or DL?