Well I'm on D now but I have a replacement device coming so ideally I'd like to side load the E build since I'm on Verizon on the new device once it gets here on Monday.
I flashed E and after a few hours flashed back to D. I cannot not really explain it, but it seems D was better for my reception and WiFi. I then heard ATT is sending out the D version which is the network I am on.
I haven't noticed any change in the signal from D to E on VZW but... I have had better luck with VoLTE. On D the LTE advance calling wasn't an option till you went into the dialer settings. With E it all works perfectly. I would flash E rather than stay on D since E is what Verizon is shipping.