My local shop has been suggesting I use grease over oil because you don’t have to apply as much and is just overall better. What’s the consensus here for AR platforms and pistols?

Continuing in my seemingly never ending endeavor to simplify the chemicals on my bench, when is grease more appropriate than oil, and vise versa? This will obviously get a billion different answers, most people seem to use only oil, and some only grease. Personally I only use Hoppes no.9 lubricating oil (not the bore solvent), comes in a nice little squeeze bottle with a needle tip. However I have had people tell me over the use to use it in A) the rails on a bolt action, and B) the rotating surfaces of an o/u shotgun. And they never specified exactly what kind of grease so I just figure bearing grease, white lithium, marine, etc; pretty much any general purpose grease from a grease gun. So My understanding is that grease is probably better in low speed, high friction areas. For example on an AR it would probably be better to put oil on the bolt and inside mechanisms, whereas grease would do better on the charging handle maybe?

Just kind of curious what everyone personally thinks/ uses, this is one of those topics you'll never get the same answer twice.

P.S I use no.9 bore solvent and BS gun scrubber. Been wanting to switch all three to a CLP, any good suggestions? Im just worried that it won't be as good of a solvent or lubricant as what I already use. (though Im not worried about the protection part, I use BC barricade since it doesn't leave residue, and I wont be changing that, eg I am only worried about the inside of the gun)