Honestly, I think those expense ratios are so low to begin with that at your age choosing to go out to eat only a few times this year will have a bigger impact on your financial situation. I wouldn't get hung up on the expense ratios. That being said, here are a few things you might want to know before making a choice.
- The 401K has ERISA protections*. So if you get sued for some reason, there are certain circumstances where the money in your 401K cannot be touched.
- You can still make your 2014 IRA contribution until April 15, 2015. 401K contributions must come from a paycheck during the same year of contribution.
The bigger question is which kind of 401K or IRA do you put your money into?
In the IRA case, is your AGI so high that you cannot make deductible contributions to a traditional IRA? If that is the case then you might consider making a backdoor roth contribution.
http://www.bogleheads.org/wiki/Backdoor_Roth_IRAOut of curiosity, are you able to make after-tax (not to be confused with Roth) contributions to your 401K? Another option to consider is maxing your pretax/Roth 401K and then continuing to make after-tax contributions that could eventually be rolled over into a Roth 401k or Roth IRA.
*I am not a legal or financial professional. Please consult your lawyer or financial advisor for professional advice.