I was trying to make the same decision last year. Not sure if the 981 will be too awkward with a full tube? I used to own a 783 22 mag with a tube and did not recall it feeling much different when it was fully loaded.
The only feature I did not like when handling the 981 was the plastic stock. The 925s wood stock is not really a thing of beauty either! But the plastic stock just made the 981 seem too light.
I went with the 925 for nostalgia reasons - was very much like the Glenfield I owned as a kid. I have not had feeding problems with it but have not fired it too much. I replaced the stock with a Marlin laminated stock and it looks 100% better! If I chose the 981 I would have replaced the stock on it as well.
I don't like the way the 925's mag protrudes out the bottom of the stock. With the 981 this is not a concern. The 925 is easier to reload from at the bench , just pop out the mag and leave the rifle resting. The 981 requires more work to reload but as you mentioned , with the higher capacity you need to reload less often.
For carrying in the field with the rifle slung over the shoulder the protruding mag of the 925 could be a pain - literally! The 981 with the tube might be better in this case.
Well , hope I helped a little!