This is a grease thread, so might turn out like a chainlube thread!

One thing to know about grease is that LITHIUM grease is said to be water-retaining, so would be a poor choice for wet riding conditions.

As far as different grease viscosity preferences, I firstly use the very stiffest grease for headsets, where lighter grease seems to literally fall out of the lower cup!
Most greases, when filled to the right amount in a bearing assembly, will not recirculate continuously.
I think this is better than grease which is so clingy that it gets dragged around, for several reasons.
Firstly, might external contaminants get churned into the ball track rather than being repelled by a stationary wall of grease?
There is also the consideration of viscous friction.
But hardened ball bearings don't need a recirculated lubricant, only a grease-surrounded environment that will "wick" a bit of oil to the rolling surfaces over several years time, keeping them from ever drying out.
It's probably good that a newly-packed hub does recirculate the grease for a while before the grease settles down though. I've seen crudely-machined races and even chrome plating that immediately flaked off of a bearing cup's races, and it does no good for these chips to roll around continuously instead of being absorbed by the entire volume of grease.

Well-made ball bearing assemblies need VERY little lubricant but thrive in a moisture and dirt-free environment.