Oil temps is good.
Engine temps are deceiving, because unless the engine is running, at full temps, with air moving over the cylinder, it's never consistent. This is the caveat with air cooled bikes and inconsistent temps, which is why it's so hard to get them through emission requirement testing. Despite, Emissions doesn't test idle and WOT.
As well, temps have to be taken as close to the spark plug hole as possible.
Oil temps are a good indicator.