Cellularinsights has compared performance between the 2 iPhone 7 modems
 

Some solid data to look at RE: the difference between Intel and Qualcomm modems. http://cellularinsights.com/iphone7/ tl;dr the Qualcomm variant has better throughput overall, especially at low signal levels. Apple also apparently crippled the Qualcomm so it is in line with Intel (no 4x4...

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Courtesy of WestNet Wireless
www.westnet.ca