Better choice for long range shots?

get a 280 ackley improved and never look back

Yes

White tails or pigs. Mainly pigs as I doubt I'd ever take a shot at a whitetail over 300 yards

I prefer my 30-06 but that's just me cause I've been hunting with one forever.

I have a WSM .270 that I also like but the ammo $$$$$ is insane.

Not as familiar first hand with the .280, but the 06 will do a 400 yard shot all day long. The .280 is an excellent choice but due to lack of first hand knowledge I would go with the 06.

I use 150g core lokt in my 30-06.

Difference is almost negligible. Put your info into here LINK

I'd like the .30-06 but not in a remington 710. For practical use I don't think anybody would ever notice the difference. Stuff will die equally dead at equal range with both of them and a competent user.

If we were taking a purpose built rifle the 06 wins handily IMO because it can launch heavier bullets.

What optics do each of these have. Also invest in a good rangefinder. Practice with a few different bullets if possible.

Half a dozen vs six. It's a matter of which rifle/scope is up to the challenge. Considering the 700 is equivalent to the hand of a vengeful god and the 710 is basically a tomato stake, I'd go with the 280.