The best walkup is the one with
8 or more working girls
who are younger and fitter than average
which is within a short walk or travel from your workplace
but not TOO close for someone to recognise you!
with a discreet entrance off a side-street
Enough variables in there to make it a completely personal decision ... which leads to the conclusion that:
ultimately the best walkup is the one with your favourite girl in it!
which - although I haven't reported recently - I have reported, so those who take the trouble to read reports will know