@Yoshi M.
I'm not sure which has better return - stock market or RE. It's been discussed / argued many times in the past and I'm sure it will continue to be a hot topic for years to come. Regardless, I think it depends on the time period and location so you'll get different answer depending on what people use.
If you're not sure you want to live less than you can so you can save more for the future, perhaps you should start with a budget. Identify what's "nice" to have and maybe set up goals to treat yourself when you achieve your goals.
There are pluses and minuses with both ROTH 401K and REI. Do you know your investing personality? Are you risk averse? Do you want to know all the details of your investment?
If anything, contribute enough to get the full company match, and save the rest outside your 401K to buy RE locally and manage them yourself. Also, make sure you find out what funds your ROTH 401K offers and ask your HR to provide fee info. Look for simple index funds with low fee and invest for the long run. I only wish I maxed out and had the ROTH options when I first started.
Good luck deciding.
Henry