It's more in areas of weak signal that you may notice an issue. At one point I had an iPhone with a Qualcomm modem and one with an Intel modem in the rural area where relatives live. The Qualcomm reported 2 to 3 bars and the Intel none on the same network. This was also the case in several other transitional areas I had been to. That's anecdotal of course, but just peruse the threads on the subject here. Intel modems aren't "garbage" but they simply aren't as good as Qualcomm modems--though Apple has the resources to fix that if they get these patents.Here’s my result on an iPhone XS Max with the supposedly “crappy” Intel modem. Done on a moving SkyTrain while going to work the other day.
So I don’t buy the complaints it’s a bad modem or somehow slow. On paper the Qualcomm modems are better, but that doesn’t mean Intel modems are garbage. Nobody would ever notice the difference in real-world usage and any issues they’re having are more likely an issue with the network, congestion, the service they’re connecting to or their physical location and not because of modem differences.
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If you are in a large city or an area blanketed with coverage you probably won't notice a difference at all. However, it's usually when you are in remote locations that it's more important you are connected.