for N/A tuning the VX Sensor should be ok. turbo applications not so much.
it really depends on where your target A/F ratio is.
But a true wideband is going to be more accurate.

if you're dyno tuning, the VX would be fine to get you close. Once you're on the dyno, who cares what the A/F is. more power produced is better no matter what the O2 says.