I would use motorcraft..
my first gen had one bad sensor, I watched it with the scan tool.. it was slow and lazy.
so I got two bosch sensors, and replaced the slow lazy sensor and kept the other for a spare.
The new bosch sensor was slow and lazy like the old one.
I pulled it out and put the other one in there and it was slow and lazy.
I took them back to Oreilly's and got a motorcraft 02 and it solved the issue.
After swapping the passenger side 02 THREE TIMES I was sold on the motorcraft 02..
it may have been as simple as the plugs didn't connect as well...but none the less my first gen didn't like the bosch 02's