I actually agree with you if we're talking teams that can win a championship. Generally, an Elite offensive team with a very good though not necessarily elite defense does seem to have a better shot at winning it all than an Elite defensive team with a very good though not necessarily elite offense based on historical performance, though both have gotten it done. The major outliers who won it all without having both a strong offense and defense were offensively skewed teams as well. I think it might simply be because to win a championship, at some point you're going to have a game on the line where you just have to make a shot, whether open or otherwise. That said, we'd still be talking contenders here as in Top 3-5 Offense and Top 25 Defense vs Top 25 Offense and Top 3-5 Defense
I responded more along the lines of this isn't an actual title contender and you just get to select elite offense and meh defense or elite defense and meh offense. And for that I'd take elite defense every time as I do feel there tends to be a much higher ceiling there in both making the tourney and getting to the second weekend