Here was one interesting post: "From PCM tuning experience (on W-bodies) out of NTK, Denso, AC Delco, I like Denso the best. For whatever reason with the Denso fuel trims make up their mind and stick with it for a given rpm and throttle. If that makes any sense "
And another from the Jag forum:
"There is a difference between the Denso and Bosch wideband. It's has to do with it's lambda voltage. If you see any type of problems with A/F trims or MPG, you need to find some Denso replacements."
Your results may vary.
I think I'll mess around and get 2 pair of Denso's.