I successfully use LaTromba T2 (new bottle), Ultra Pure, Hetmans (various thicknesses) and Monster (various thicknesses). LaTromba T2 is the cheapest (in Europe). I buy it by the case.
They are all "equal" on my horns if applied properly. They are much faster than my fingers, last for at least a week of heavy playing. I have no sticking or other artifacts.
Horns that I use these oils on:
Selmer Radial 2°
Monette Raja C
Getzen Eterna 4 valve flugel
Cheap chinese pocket trumpet
All of my rotary trumpets
I also use these oils to keep my natural trumpet slides and bows from oxidizing together.
Clean horn first, wait until it is bone dry, apply oil sparingly. Never mix oils and greaes on the same horn.
It is not rocket science and I have no preference - maybe I am simply not good enough to notice? Maybe I simply do not have a "need" to have a preference?