Could someone please recommend a Brooks saddle for commuting?

I'm female and prefer a upright riding position.

I have never owned a spring saddle and this will be for my newly procured Raleigh Stowaway.

I looked at the B73 and B66 but am completely unsure which one would be better for me since there isn't a shop where I can try them both out at.

Does anyeone have any experience with these saddles?