Everyone’s mileage will vary, but it’s been my general experience that after I replace/repack bearings on one side it quiets that side down enough that I start hearing the other side.
And really, unless you’ve got a cracked seal that has allowed dirt and moisture in to foul the bearing on one side or the other, they should all have approximately the same amount of wear on them.
If you’re looking to save money then only replace what you need when you need to. Personally if I have to take my daily driver down for maintenance I’ll do it all at once just because I can’t afford to have my DD down for more time than necessary.

not really the case with hub bearings.

huh? lol

My bad. The quick reply button is right above the "Up" button to get back to the lounge. And I'm on a rough tractor.
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I just don't see that in my experience with wheel bearings, and we do quite a few.