I apologize in advance if this topic has been explored repeatedly; I am new to the S&W forum. If I'm bringing up a tired topic, please feel free to direct me to the appropriate sticky thread, and I will slink away quietly! 
I am not new to firearms in the sense that my husband and his friends are all (responsible) gun enthusiasts. I was taught to shoot by a remarkably talented marksman. (Not my husband - I know better than that!) However, I have not shot very often (time and $), and I have never owned my own firearm, though I've been considering it for a while - I usually just use one of his. Now it's time.
An alarming scenario occurred this week in my n'hood, and I now really want to have my own handgun, something that I can truly feel comfortable shooting. I prefer a revolver, that much is certain, and I don't want something too heavy, though I know I may not like the kickback on something too light. I really liked the feel of two S&W revolvers that I held today - a 442 with a 1 7/8" barrel and a 642 with a 2.5" barrel. I'd probably swap the grip out for a slightly larger one, as I'd prefer to have all of my fingers wrapped around the grip for control. I know they are the same frame, but I'm really torn on barrel size. I know the longer barrel will buy me more accuracy, but I suspect that if I needed this thing, I'd already be within pretty close range (unfortunately).
What are your thoughts on these two guns, other than visual appeal? Is there another S&W that you think I should consider? Am I underthinking the level of control available on such a light piece?
I look forward to the feedback. Thank you!

I am not new to firearms in the sense that my husband and his friends are all (responsible) gun enthusiasts. I was taught to shoot by a remarkably talented marksman. (Not my husband - I know better than that!) However, I have not shot very often (time and $), and I have never owned my own firearm, though I've been considering it for a while - I usually just use one of his. Now it's time.
An alarming scenario occurred this week in my n'hood, and I now really want to have my own handgun, something that I can truly feel comfortable shooting. I prefer a revolver, that much is certain, and I don't want something too heavy, though I know I may not like the kickback on something too light. I really liked the feel of two S&W revolvers that I held today - a 442 with a 1 7/8" barrel and a 642 with a 2.5" barrel. I'd probably swap the grip out for a slightly larger one, as I'd prefer to have all of my fingers wrapped around the grip for control. I know they are the same frame, but I'm really torn on barrel size. I know the longer barrel will buy me more accuracy, but I suspect that if I needed this thing, I'd already be within pretty close range (unfortunately).
What are your thoughts on these two guns, other than visual appeal? Is there another S&W that you think I should consider? Am I underthinking the level of control available on such a light piece?
I look forward to the feedback. Thank you!