Have you had an opportunity to shoot either of them? That would be ideal.
I had a Tikka T3 lite in .30-06 and it was too light to shoot many rounds at a time. However, it was handy to lug around. In .223, I imagine it would be pretty sweet all the way around.
As far as the Remington, I've only ever owned the 740/7400 type semi-autos in .30-06, so no help there.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams