I have a Lacanche Cluny. I've had it for about three years and absolutely love it. We cook like crazy around here and it has been just what we wanted. I wrote a long report after 2 years of use. See link below. The stove is 40". I didn't look at the Le Cornue. The good ones were out of my reach and I wasn't sure about the lower priced ones quality wise. The only time I looked at Aga was back when they were on all the time. Can't speak for the new ones.

You might have better luck asking questions in each stoves forum.

Here is a link that might be useful: Lacanche part 37