I find the closest to the OEM the better. Always price is a factor, as is how easy is it to get at. With older vehicles like HHR it's sometimes the sellers inventory that makes a deal on-line sellers that is. Rockauto close-out section for example.

Anyway new cat / new O2 sensors makes perfect sense. If a year old and under 25k miles it's up to you $.

 

ACDelco/OEM o2 sensors are rebranded NTK/NGK and Denso. Bosch has a really bad reputation. I suspect that there are only a few companies that manufacture O2 sensors.