If you are going to be able to check the camera every three of four days I would go with the plot watcher.

I have some concerns about the battery life though. If I'm correct that would be over 150,000 pictures on the same set of batteries. I don't know plot watchers very well but that sounds like a HUGE number and I'm not sure I'd trust that. I've never used the plot watcher function on any of my cameras but I think if you are going to use it solely as a plot watcher I'd use one specifically designed as a plot watcher.

Whenever I purchase any trail cams I always google the reviews and check BPS, Cabelas, Trailcampro, chasinggame and the like. The last two are ones I really like. Good luck!