I think my LT1 Z28 came with ACDELCO AFS75 O2 Sensors... or maybe not
I'm looking on RockAuto.

What do people on here recommend?

Most threads seem to say the LT1 works better with the ACDelco

ACDelco AFS75 . The info actually shows it as a downstream Sensor.

Bosch 15703. Bosch seemed to get a bad rep, although i'd generally go for Bosch here in the UK as a general mark of quality.

I've just seen some NTK 21006. NTK is regarded as a quality wideband sensor in AFR guages. (Not this sensor obviously).
ACDelco 2131325 Professional. shows as an Upstream sensor. Would the ACDelco professional be better ?

Thanks
Mitch