Hi Greg;
FWIW: As it looks right now, the PB.Net product will be going away with the transference of the PB technology from SAP to Appeon. So even though you test the WS via WCF in PB.net, you might want to implement the final production WS interface via VS.
If you look at Appeon's previous Webinar from March 8, 2016 - you can see that Appeon is planning to add WCF to PB Classic in the future (but not their 1st release of PB).
Just my $0.02.
Regards ... Chris