The weight difference on a postal scale is, iirc, 6oz unloaded between my 2 1/2" M66 and my 3" M60.
Thats 24 oz for the M60 and 30oz for the M66. or 25% more for the M66, which is significant.
I didn't weigh them side by side just picked one up then the other, the 6oz difference just wasnt enough to sway me over the K frame's better action and extra round of .357 as I only carry my Model 66 when I'm in an area where there might be 2 or 4 legged trouble.
South Florida only has 2 seasons, we have our "Summer" wIth windows open and great weather when it's snowing up north, the rest of the year we have our other season called "TOO DANG HOT (TDH)" .
When it's TDH you go from the AC house to the AC car to the AC job or mall which makes wearing jackets impractical (you can't open carry in Fl) .
During TDH mostly pancake OWB with an untucked shirt or pocket carry a Model 37 ( weighs a whopping 15 oz) .
When going to Mi-Jami, Ft Liqourdale or WPB carry a SW 6906 (26 oz) due to its 12+1 capacity because of the greater amount of miscreants in those places.
Sometimes rotate in a Model 3953, 39-2, 59, Model 12-2 or a 4" Model 29-3 Mountain gun if hiking in bear country.
The 3" Model 60 in .357 is a fine revolver but i already have enough J frames,
The obvious solution is to have several or one of each.