You can't go wrong with either! The Remington pump is an iconic PA deer rifle and both calibers are proven to do the job. I'm partial to the 30-06 because that's what I have always used and I have the utmost confidence in. However, one of my best friends shot the biggest buck I have ever seen and dropped it in its tracks with one shot from a .243 last year. Tough decision, but like you said you really can't go wrong either way. Best of luck on Monday!