I would go with Ingram personally, he has experience in games and has some chemistry with the offense. Murray is going to be getting his first start of the year and with the potent passing offense that Dallas has they might just rely on that aspect of their game this week against a weak Rams secondary.
Can you please check out my post "Who to start in PPR league?" and post your thoughts. It would be much appreciated, thanks so much and best of luck with your decision.