In my opinion .....
Adults at home are more likely to need a firearm during the day. Thieves like to target homes where it looks like everyone is at school and/or work. Even home invasions are more likely then. Fewer people in the area equals less resistance or witnesses.
Even if the Sun has set, you still have a lot of time before the lights are off. This is to say you might be counting on needing a weapon light more than is likely. You probably want to keep a handheld light by your bed anyway for safety, so that to me is the light to use if you're checking out suspicious noises. Remember the rules of gun safety? Pointing a weapon-mounted light at someone is breaking at least one of them. God forbid you get startled while it's pointed at a non-threat and cause a negligent discharge.
If I heard a noise from my dark bedroom, i'd be turning on lights as i walk through to see what's going on and to identify the intruder if there is one. I'd rather scare a burglar away with lights than have to confront them alone (might be multiple). The best way to win a fight is to avoid it altogether.
I think the best handgun choice is the one both of you are comfortable operating under stress. Having said that, one thing to factor into that equation is firepower. Revolvers with 5, 6 or 7 rounds are normally sufficient, but what if it's not? Maybe a 10+1 handgun is a better choice, along with a spare mag or two.
i'd recommend a fast open handgun safe for when you're not in the same room with the gun. It'll deter at least casual thieves (cable guy, carpenter, etc.) without interfering too much with access. It's also a good idea if you have grandkids or nieces and nephews visiting frequently.
I keep a weapon light attached with 10+1 AND a handheld light next to my fast action safe. I also keep some rather large folding knives upstairs and down as a failsafe.
Things to think about.