Footnote to my previous post. Maton Necks vary, but I've found all the ones I've played uniformly comfortable. I have to admit that I got my frets filed and action lowered when RSI type problems started showing up, but the Matons are still my choice for ease of playing.
12 string necks are wider, but not noticably more that my 6 string.
It was the Maton 12 that won me over to that configuration and I played 12 string for most of my playing life. I can do some useful finger picking on the Maton 12 which some folk find hard to comprehend. Many seem to visualise the 12 string as a rhythm instrument only. Any pattern pick incorporating the high third against the top E (which actually lower that the octave G) makes for some special harmony possibilities.

Maton takes special trouble with their neck cross section. It was that difference between the Maton elliptical cross- section and the more chunky section of the Martin that endeared my Maton to me. She's much more friendly to these aging hands.

                            Good health, Jack Halyard.