I would find a gun range that rents the models you're interested in and test them out. You may find the one you thought you liked the most by look and feel is the one you like least when you actually shoot it.
I EDC a Kahr CW45, so my first choice out of your list would be the Kahr. I like the Ruger as well.
"They have gun control in Cuba. They have universal health care in Cuba. So why do Cubans want to come here?"
– Paul Harvey 8/31/1994