OK thanks Robert, perhaps I was over simplifying this here, and got PsF mixed up with interlace conversions, thanks again for the clearing this up. Yes, I was not saying there was a big difference between 29.97p and 24p, just that the latter has a more filmic/cinematic look, but this is subtle. Yes, there is a big difference between 29.97p and 59.94p, as motion blur goes, with the latter being sharper, with less blur and more video like in its look. I was trying to say, there was not a noticeable motion blur difference due to fps difference between 29.97p and 59.94i, which is technically the same frame rate. That said, yes, I agree overall, interlace is overall, smoother looking as a result of the interlaced signal, and that is a difference you will see.
So the bottom line, and my original reply, I do not see the OP getting more or smoother looking motion blur using 1080p over interlaced, as was his original question, wanting to use 1080p29.97 or 1080p24, instead of the interlace signal he is currently doing. To me, the only reason to switch, would be if upgrading to cameras that do not have a 1080i output.
Bottom line, the OP should just shoot some tests, and see what he likes.
Cheers