I looked at your other thread and here's how I see your situation. Remember that some of this is based on speculation about what will happen in the future.
Many people in the 25% tax bracket retire and find themselves in the 15% tax bracket. For those people, it is probably better to take money out of a 401k/457/IRA at 15% in retirement than to pay 25% now to get the money into Roth status. For these people, it is often advised to use traditional 401k and Roth IRA which will give them some of both types of assets, but usually more in traditional than Roth.
You, however, have a pension. Or might have a pension. You are more likely to retire in the 25% bracket than someone without a pension. Obviously, all this depends on your final salary (at the top of the 25% bracket, near the center, near the bottom?), how large your pension will be, and whether there will be SS in addition to the pension. But just as a general statement, you are more likely than a person without a pension to retire in the same bracket you finish work in. For you, paying 25% now to get money into Roth status is the same as paying 25% later to take money out of a 401k/457/IRA. This would argue for putting more money into Roth status and less into traditional status than someone without a pension.
However, since we don't know the future I would not go more than half Roth and half traditional (meaning overall in all the accounts) at this point in your life. That's just a number that feels comfortable to me - it is not any sort of magic number. You'll have to find your own comfortable number understanding that life never presents itself like you think it will. Job changes, accidents, illness, kids, changes in tax law, etc. all might happen so it is best to expect the unknown and keep as much flexibility in your financial life as you can. That's why half and half fees good to me.
As for using the 401k or the 457, since they are identical, it does not matter which you use. The 457 money will be available on leaving that job whether you are 59.5 or not. The 401k money is available, but you have to jump through some not-too-difficult hoops to use it if you retire "early".
The nice thing about having both plans available is if your wife moved to a job with a lousy 401k you could put all your retirement money into your 2 plans and not use hers at all (or only use it up to the match). Not much of an issue now since she has two really good choice in her plan (500 Index and Inflation Protected bond fund).
If you decide to put some of your 401k/457 money into Roth status, there might be some differences in how the money rolls out to Roth IRA. I believe the Roth 401k rolling to Roth IRA would have a 5 year clock on it if you are not 59.5 years old. I do not know if rolling Roth 457 to Roth IRA would have a 5 year clock since that money does not have a 59.5 year old age requirement to it. This might be a reason to prefer the 457b. This is probably a question for a tax expert. You might pm Alan S and ask him. Or maybe Peter Foley rolled his Roth 457 to Roth IRA and can tell us.