I've owned all of the Canon Rangefinders models after the IVSB.
By far my personal favorites are the L1 and 7s.
I would have liked the bottom wind Canons if they had offered top wind as well. I've seen such a modified camera on ebay. Trigger wind alone was just too awkward.
The L1 got it right with a 3 position viewfinder, lever wind, accessory shoe parallax, and a GOLD RF patch. The gold patch is important because the later silver RF patches of the various V and VI models usually self disintegrated over time becoming quite flare prone.
The P was OK, but often flares too much, making the L1 a better choice. The P also lost the previous Canon's unique accessory shoe parallax button for automatically controlled accessory finders.
The 7 had all the 35 to 135 framelines, but suffered from a clumsy meter that practically never works and having no accessory shoe. Worse than that, stylistically the 7 is simply an ugly camera compared to its stable mates.
The 7s overcame all the problems of the 7, but is still not as well made as the L1 when you compare the side by side. Still, it is hardly a bad choice.
Like their Nikon brothers in arms, all of the LTM Canon RF's are more reliable than Leica M3 or M2, needing both CLA's and shutter replacements about 1/4 as often as Leicas in my experience.