@MDM @terran, you guys are right, thanks for replying, and making me think about it more.
All else being equal, one should contribute to a 457 before a 403b/401k. But in this case, it's not equal due to the different ERs. So the answer to your question is, it depends.
How close are you to FIRE? Yes, you can draw from a 403b in early retirement through a roth conversion ladder, but you will still need 5 years of living expenses to bridge the gap. So if you are just starting out in your career and your investment horizon is long, do as you are doing, maxing 403b, then 457. If you are closer to RE, then start allocating more money into the 457 to bridge the 5 year gap in the roth conversion.
How much of a EF do you have? You can use your 457 as an emergency fund. The 5 year roth conversion ladder isn't going to help you if you get canned unexpectedly. However, if you have the funds in the 457, you can draw from that in the event you lose your job, until you find your next job. If your emergency is not a job loss, well you have a healthy chuck of money going into your retirement accounts which you can set to 0% temporarily.
Does this even matter?
You don't tell us your salary, but it looks like you have a decent savings rate, and this is what will ultimately determine when you can start your early retirement. The asset allocation might make a difference of a few weeks to a month or two. The allocations between 403 and 457 might make a difference of a couple of days. The only thing in your control that will make a significant difference is your savings rate.