Not sure what it’s like for outcall only wg’s on AW as I only book incalls now but a few years ago I regularly saw a couple of wg’s who offered outcalls only. Their rates tended to be very similar to wg’s offering incalls - ie £120-£140 range but I’m going back 3-4 years.
There’s definitely a different vibe to the girl coming to you over incalls, I found they worked well for me for meets of 2 hours or more.