Another plus point for PN over BT is for just a fiver you can get a fixed IP something BT don't offer for home users. My speeds are same now as they were with BT.
I do find BT's router GUI better than PN's for port forwarding etc but didn't take me long to work it out. Everything is hard wired apart from mobile phones so not sure if WiFi range is better or worse .
You can use your BT HH/SH on PN.