I can't take your poll because I don't have WiFi issues but do have GPS issues. Your questions require both to have issues. My GPS works outside but not indoors like my Droid X. I get 15 MByte/s uploads and 5 MByte/s downloads regularly. I don't trust the power readings of any WiFi device. If you want to compare two devices, move away from the router until one device can't connect anymore. That tells you which one is most sensitive.
I'm satisfied with my Prime.