The only disadvantage of the Vernier Optical DO Probe (ODO-BTA) is that it costs more. It is both easier to use and more accurate than the older Dissolved Oxygen Probe (DO-BTA). The chart below shows a feature comparison.

Feature Optical DO Probe Dissolved Oxygen Probe
No calibration required
No stirring required
No warm-up time
No electrode filling solution
Automatic pressure compensation
Automatic temperature compensation
Measure in mg/L
Measure in % saturation
Compatible with LabQuest interfaces (all models)
Compatible with Go!Link