How important is it that your PhD advisor is an experienced, well-known faculty member?
Just to give contrast with @Buffy's list of disadvantages:

new professors are often full of energy and enthusiasm
they will probably start with a small number of students, so you may get extra attention
they may have better rapport with you since it hasn't been long since they were graduate students themselves
the exact match of research area seems like a big bonus
as you suggest, the lack of prestige/ranking of your advisor is unlikely to be as big a deal when looking for teaching rather than research positions

The only disadvantage I see in addition to @Buffy's list is that a new faculty member might be a bit overwhelmed with all the new things they have to take on (teaching, admin, research, in addition to graduate advising).
All that said, IMO the most important characteristic of a graduate advisor is a good match in terms of personality/mentoring style/expectations. Hopefully you will have a chance to speak/interact with them more to find out about these things before choosing your supervisor.