OIS helps a little, but not a lot. Here a vlogger shooting with the G7 and the OIS-equipped 14-42 lens:

• Vlogging on the Panasonic G7 by RuggedTribeEnt

Here's Chris from The Camera Store shooting himself one-handed with the G85:

• Panasonic G85/G80 Hands-On Field Test in Germany (With FZ2500 Video Impressions!) by TheCameraStoreTV

A $450 G7 on a decent gimbal to steady the camera will cost you the same or more than a $897.99 G85 body with IBIS.

If budget permits, I would get the G85.

Hope this is helpful and good luck with your decision!.

Do you think a G80/85 with ibis/dual is would result in more stable shots than a g7 with a gimbal?

A good gimbal will be more stable than IBIS - but the G85's IBIS is pretty darned stable, as in this example (all shots handheld except for the night shot at the end):

• Panasonic Lumix G80 (G85) 4K Samples by Digimanie.cz

Which do you think would be the more affordable purchase?

Here's how your numbers play out:

Panasonic G7 with gimbal

• Panasonic G7 body used - $450

• Beholder MS1 gimbal - $499

Total Price: $949

Panasonic G85 with IBIS

• Panasonic G85 body new with IBIS and 12 month factory warranty - $897.99

Total Price: $897.99

In my view, the G85 will cost you less - and eliminate the hassle of keeping a gimbal powered and balanced.

Hope this is helpful and good luck!