go with whatever matching money that wags offers. thats free money and goes into what is call a tax deferred vehicle. what that means is that the money you put in there goes in before taxes are taken out of your paycheck and gains interests tax free. when you retire and withdraw money, then you pay taxes.
once that's filled up to the max percentage that wags will give you for free, full fund your roth ira. this is a different type of retirement account because the money you put in is already taxed. this means any interest you gain in this type of account will not be taxed later on when you withdraw it.
once you fill out the roth, and have more money, go back and put the rest into the 401k or other tax deferred account.
be sure to take into stride whatever goals you have though. you need an emergency fund, car fund, or house downpayment fund. there's a balance to this and it's not throw everything into retirement and live like a goat. on the flip side, due to the powers of compounding, should you live like a goat the first 5-10 years of your working life and save like a madman for retirement, it's highly probably that you will be able to save less as you get older and enjoy life much more, all the while being ahead of the retirement game and possibly retiring early as well.