I have had many different cams over the years.
I have settled on DCS-930Ls (two pack is $70)
and laptops with HD usb webcams. The laptops
run blueiris which does the video capture and
notification.
By far the main benefit of the cameras on the boat is
that I can monitor the power to the boat. No pics = no power.
No power = bilge pumps and refer on batteries
The main choice of any camera is the field of view.
Many fixed focus cameras have a very limited field of view.
The main choice of placement of the cameras is bugs and lightning.
The motion sensor will give you thousands of pics of spiders building webs;(
If you have an old laptop and web cam I would try that first inside the boat.
Blueiris is inexpensive, if you want a free program try YAWCAM.
The DCS930s work well for outdoor use. I have some on solar panels/batteries.
(45 Watt Solar Panel Kit from harbor freight)