In the limited testing I've done so far, I've observed the following:
Test 1: Drove to 10 different places in the city, checked signal on phone
Both appeared to have the same signal, sometimes Intel was better, other times Qualcomm was better. Didn't seem like a definitive difference.
Test 2: Parking Garage Basement Test (Drive Down and Back Up)
I had both phones on, drove into a parking garage, and started slowly going down level by level.
From my initial observations, the Qualcomm seemed to lose the cellular data connection first, while the T-Mobile dropped down to 4G. After going down a bit further, both phones lost signal completely.
I slowly started driving back up the ramps to get out of the garage, and I noticed the Qualcomm recovering the fastest with a bar with LTE, while the T-Mobile found one bar and had no data. After slowly going up further, the T-Mobile showed 4G, and later on both showed 3 bars LTE.
I am not sure if I trust one over the other, but all I can say is I am happy with my Verizon Qualcomm phone, the last of it's kind. In my personal tests, the download speeds were noticeably higher, and I am more than satisfied with that. I hope more tests come out besides the one from cellularinsights, but at this point I've had very positive experiences with my phone.