Not to much to decide...
Go to the shooting range to find out who will let you try their rifles,,, a few in 7mm and a few in 300 Mag...
Take this learned info to the rifle shop and buy the 1 you liked the most...
Lifes to short to pick straws when you'll either get it right from the get go,,, or you'll change it up in 5 or 7 years...
Either 1 of those cartridges will fill your needs,,, heck,,, you got me and my friend beat in the game of Thunder since we have mid size rifles less than the 2 your looking at...
Keep it simple and get at it,,, you'll Grin from ear to ear with either of them I'm sure...
Cheers from the North