There is going to be some disagreement on which data fields are the most accurate and up to date. I'll bet that some geek at TER could probably do a statistical analysis to get real numbers, but I'll just give you my gut feeling.  
.
The topmost info is Ad Website. That's where I would start. That is Source #1. Some Providers are very good at updating some (or all) or their ads to keep them current. (Some ad sites go stale and harder to update but it varies with each Provider. For some, it's easier to update a tryst ad than to edit / update their personal web page.)  
.
Personal ad and Blog are similar but I find some ad sites to be more useful for up to date info.
.
Email - they tend to be up-to-date but might be stale. Check her ads #1 for her current email. But don't pester her without checking other sources for her schedule / city first!
.
The City field is not always updated in the Profile. It certainly cannot be updated quickly enough for a touring Provider. Other cities, likewise. Let's say she's touring in NYC; a review is submitted 12 weeks later and asks to add NYC to her "other cities" Profile. She already left NYC 10 weeks ago!  
.
Phone - they tend to be up-to-date but might become stale. Check her ads, #1!  
.
Then skip down to Reviews. Review dates are the date the review was SUBMITTED.  So you can't just click on the most recent review and see in what City the meeting took place. A March 2026 review might be about a meeting in Jan 2026!