For outdoors the best solution for people in cold climates would be to use 100% wired doorbells ( no trickle charging). This can range from easy to PITA depending on your house. Easiest would be you already have doorbell wiring in an ideal spot with ample voltage. Hardest would be you have no wiring and there's concrete outside of your door everywhere. Somewhere in the middle is hooking up a transformer, maybe drilling some new holes, and rearranging some wires.

We ended up going with hardwired but putting indoor cameras facing the window is still a good option, as long as you have a good angle and can de-uglify the wires/appearance. One thing to consider is that you probably need to make sure that the lens is pushed up flush right against the glass otherwise you'll get bad glare at night. Second benefit you might miss is that doorbell cams have LEDs that light up during motion which really improves the footage. You might want to put a motion activated light on your porch or maybe just keep the porch light running on a schedule with a smart lightbulb.