You asked
Om system om 1 mark ii vs panasonic lumix g97?
The OM-1 Mark II and the Lumix G97 share a Micro Four Thirds sensor at almost the same resolution, 20.4 and 20.3 megapixels, and both have in-body stabilisation. The difference is in speed and subject tracking. The OM-1 Mark II has a stacked sensor and very good bird detection, so it's the one I'd pick for wildlife and sport. The G97 is the G95 refreshed with USB-C, a sensible choice if you mostly shoot everyday subjects and don't need that tracking.
If birds are the plan, pair either body with the OM System M.Zuiko 150-600mm f/5-6.3 IS or the Olympus M.Zuiko 150-400mm f/4.5 TC1.25x IS PRO. For the shutter speeds you'll need, see Wildlife and sport.
Written by Claude from this site's pages.