The "tax bucket" examples from that link are simpler than reality. In reality, people don't have W-2 income exactly matching their standard deduction, or a second job exactly matching their personal exemption.
I prefer "about $10k / person" in deductions, and then figure income from there. Taking OP's example, that's $50k-$70k taxable pension - solidly in the 25% tax bracket.
Couple of qualitative differences between Roth and Traditional if the tax situation is a tie: we're at historically low tax rates. If they go up, Roth will have locked in lower tax rates. In Roth, what you see is what you get - the withdrawal is not taxed. If you are a saver, both IRAs have the same contribution limit ($5,500/yr). But the Roth contributions are after-tax where Traditional is pre-tax, so you're saving more in the Roth.