I also can’t compare my rPi3 with my ESPs since I don’t use WiFi on the rPi3.
One example that I can share is:
ESP (Wemos D1 mini) at 50 meters away from the closest indoors AP (installed in my Robo500 case = outdoors) is reporting:
Signal: 54%
Channel: 1(11ng)
TX Rate: 72,2 Mbps
RX Rate: 54 Mbps
Uptime: 5d 14h (I lost grid power last week… I have seen much longer uptimes… it’s very stable)
I have seen very good range and reliability from my ESPs so far.