I would do neither.. get a Tikka T3 in your preferred caliber.
Tikka T3 Lite Stainless
308 Win
McMillan Sako Hunter stock
155 Scenar
Lapua brass
Bushnell 3-12x44
Sportsmatch mounts
No animal is safe at 500 yards and that barrel will last 8-10.000 rounds.
I would not bother with a Rem 700 at all.