Given the choice of nationality which is your preference, up to 3 votes each
I go on the individual WG, her attitude, what she charges and what services she offers rather than her nationality. Also with some foreign WGs they lie about their nationality anyway, the first time i see them they say they are from one place, the second time they have forgetten that and say somewhere else. So unless i am sure by her accent i take it all with a huge pinch of salt, i dont ask to see WGs passports to prove it to me.
Before the EE WG invasion of the 90s i mostly punted with Brit WGs of course, thing is they virtually never offered kissing and when the EEs arrived they charged less as well as offered kissing so for me the more WGs the better from abroad, as long as here legally to keep the Brits on their toes. Competition is always required and a good thing for punters.
As ever what makes a good WG is her own indivdual attitude, not where she happens to come from or indeed charges.
My best punts as it happens have been with English, Czech Republic, Polish WGs and a WG from Venezuela (so they all said).