Choice between government 457b vs IRA

I’m starting a new job that offers a 457b deferred comp. It allows for 23,500 max contribution. There is no match because they give a pension. The deferred comp is legally held in trust to protect it from lawsuits the city may incur including bankruptcy. The options include a pretty vast array of mutual funds and a self directed option through Schwab which is pretty much most anything you wanna invest. There is a Roth option of this as well. Is there any reason to go to my own and my wife’s own IRAs before funding the deferred comp ? I know there are limits to the Ira at 7000 each for my wife and I. Aside from that is there any other difference ? Or is this deferred comp pretty much just as good as an Ira ?