Snubs have their place and it's ideal to have one in your carry line-up. That being said, the slim 9mm and 45acp guns like the Shield (7+1rds 9mm) and XDS (5+1 45acp & 7+1 9mm) are slimmer for IWB carry, faster to reload if necessary and it's very easy to carry a spare mag.
I had a 9mm Shield, but currently use a 45acp XDS for IWB carry. My 642 is best suited for ankle or in a 5.11 holster shirt while bike riding and a speed strip in the other 5.11 shirt pocket. I can IWB my 66-2 no problem, but a slim semi-auto is just much easier and more comfortable all day. Opinions vary, but this is mine.