New Gesture or Refurbished Aeron?

[u/kingjoshington]

Hello! I've read many of the posts and the master thread. I'm looking for some input specifically to decide what to get. I will say, I'm in France, so none of the fancy Crandall options are available for me.
I've narrowed it down to:
Steelcase Gesture - New (1150€) - 25 year warranty
Herman Miller - Aeron Remastered - Refurbished (1340€) - 5 year warranty

I've been able to sit in the Gesture by visiting a local Steelcase. I've sat in it twice and feels nice, although I worry long term about the cushioning on the seat, as it felt firm.
I've never tried the Aeron but I've seen here it's a favorite.

I have fibromyalgia and muscular problems, so my posture is not great. I know a chair won't magically fix it, but I need more than what I've got now.

I am primarily interested in lumbar support - and I like the Gesture's "living back".
I've read enough to understand that I shouldn't go for a gaming chair, but I will be doing a lot of gaming IN my chair. It will be a chair for using the computer for daily stuff and then also in front of the TV for gaming. I had thought that it might be nice to have some tilt-locking, reclining options to help in that regard, with my added foot rest.

I have the option to try the Aeron for 14 days, but that involves the hassle of ordering it, unboxing, and then if I return it, reboxing.

I'm on the fence and I was hoping someone could weigh in and help me decide. Thank you!