Favourites? For me, easy!
In spite of the collection of cameras, there are only 3 that get used all the time.
The Leica IIIf gets carried pretty much everywhere local. Usually loaded with Ilford HP5.
If I'm going on a trip somewhere, or up into the mountains, or hiking, I carry the Bessa R2. I have a LowePro bag, small one with a shoulder strap, that just fits the R2+Ultron, and the 21 and 75 lenses. Loaded with (usually) Velvia 100. This is without a doubt my favourite kit - it's not too heavy or bulky, and is really versatile.
If I'm backpacking for more than a day, the R2+Ultron goes - no extra lenses. (every bit of weight counts when your basic pack is about 22-24kg)
And if I'm travelling for work, again, space and weight are at a premium, and I usually don't have a heap of time, so I take the Minox 35GT. (and usually curse that I haven't got the R2!). It's small and light, fits in a pocket, looks like a toy, and has a lens and metering system good enough to get nice transparencies.
Of course, if my mate and I are just out on a Sunday morning to take pictures - then I've got a backpack full of 4 or 5 other cameras as well.........
Tim