Thanks for all the input. I would like to stay with a stainless S&W, either all steel or steel/alloy. If I compare full size vs. compact (as in 5906 vs. 6906) I'm leaning toward full size because it will be primarily for range use and not for CCW. I like the 5906, but the the grip size may be a little large for my daughter to shoot comfortably, so I'm thinking maybe try to find a 3906? Or, is there enough difference in weight, recoil, etc. between the 3906 and 3913 to matter?
PM:
Here's my old farts 2c worth.
You said whatever pistol you buy will NOT be used for CCW, and you were looking for input regarding the 5906 vs 6906.
FWIW I have the 5906/6906/3913/3913LS/CS9 & CS45.
I use my 5906 with Crimson Trace Lasergrip for my home defense choice. The 5906 is sorta large and heavy, but it offers 15+1 capacity, absolute reliability, and the addition of the CT's really make it a very good choice, (imo) for home defense, OR casual target plinking.
FWIW my wife is 65 years old and roughly 5' tall, and she loves shooting the 5906 as it has low recoil and is easy for her to shoot well at any reasonable self defense distance.
IF there was ever a thought of using whatever you buy for occasional CCW then the 6906, using the 15rd mags of the larger 5906 (w/S&W adapter) would give you the same capacity, the alternative of ccw use, and is also deadly reliable and a pleasure to shoot.
The 5906 has an external hammer and offers the option of a first round single action shot, whereas the 6906 will be a double-action first round, followed by all single action rounds.
Everyone loves the 3913LS but I found the grip a bit too "thin" for my personal taste.. I think anyone with smaller hands would love the 3913LS. If memory serves the 3913LS is the only 3rd Gen Smith I have that only has the decocker/safety on one side.. All the others offer ambi-decocker/safty's.
Best Wishes,
Jesse
P.S. Pictures below (l to r): Several of my 3rd Gen Smiths (+HK P7), the 5906 & 6906 side by side, the 6906 (w/15rd 5906 mag & adapter) and finally the 5906..