Which iPhone has the best wireless performance?

Since upgrading to the XS, I’ve noticed that the cellular reception isn’t as good as it was on the X. The obvious difference is the Intel modem on the XS, XS Max, and XR models compared to the Qualcomm modem in the iPhone X (model A1865).
I’m wondering which iPhone had the best signal reception. What has your experience been with prior models compared to current ones? Did the 6S, SE, 7 have better reception than the current gen iPhones?
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