The most important thing with chains and their maintenance is longevity both of the chain,(including both elongation which accelerates cassette wear and to a lesser extent chainring wear,and side slop which causes slow gearchanging) and longevity of cassette and chainrings.
A couple of people on the forum(MickF and Meic IIRC)have proven in the past that Campag chains last longer than other chains,but it seems,again IIRC that,that's at the cost of the cassette and their cost compared other chains worked out about the same,ie;you pay twice as much for a Campag chain but don't get more than the price of two other lesser but good quality chains such as Sram 971 or 1071.
I'm not as anal as some about drivetrain cleanliness,though don't let my drivetrain get really mucky.These days I ride mostly in good weather if I can,mainly because I'm retired and can choose when and were I ride.
But when i did ride in all weathers I almost always got 4500miles+ out of a Sram 870/971 chain and wore out three chains before the cassette needed changing @ around 13 to 14,000miles,if I was feeling tight I would run the last chain for another 1,000miles or so if it wasn't affecting gearchanges due to side slop.Chainrings last 25,000miles+.
I've tried I a good few chain lubes,Finnishline wet(green) and dry(red),White Lightning(W/L),Purple Extreme(P/E),WD40,10/40engine oil,3in1,semi fluid areosol grease,and a few others I forget the names of.
I finally settled on TF2 aerosol because it was cheap,easy to use,stayed put in all but the wettest of all day rain,and learned PDQ that if the chain was lubed after a ride it dried and didn't attract road grit and muck like the wet lubes do.It didn't gum up the drivetrain and need a really strong degreaser either to clean it off like the wet lubes such as P/E or F/line green(which IMO are just chainsaw oil),nor wasn't utterly useless like the dry lubes such F/line red or W/L both of which became non existant after a short ride of say 50 to 80miles,in which time I could hear the drivetrain getting progressively noisier(I think in the past I've described them as someone running behind me shaking a bag of old spanners).
Anyway that's my personal experience which may differ from other people's,but I'm happy with TF2 aerosol and my drivetrain longevity