Fuji 6x9 user here! I settled on ISO400 choices mostly:
HP5 as a good allround B&W. Timeless and bulletproof, souped in HC110. Bonus is that in europe the pricing is quite good, and appreciated by my tight budget. 1€ difference compared to Kodak's.
Portra 400 for Color. At the time of writing it sits frozen as I am liking B&W DIY turnaround, also having a fully equipped club darkroom.
Being summer, I picked some Delta 100 to use, but find not really taking it too often...
As I am out and about, haven't taken the 6x9 for a spin these last couple weeks. Gone instead for 35mm Kodak gold snapshots.
Honorable mention is Provia 100. Grabbed a couple packs before the price increase rolled in. We agreed to process E6 in the club next fall. Gorgeous to look at in medium format, currently loaded in the 6x9 awaiting an outing seeking good light.