Generally the inbuilt – though mainly as it there or there abouts agreed with the external one when I tried that (and my legs) and was one less thing to faff with.
Odd thing on Tuesday is it seemed to sort its self, ended up with 85 rpm average which is a bit high for me – I tend to churn not spin – but not too bad, was just down right odd off the start, as if I were in erg or something.
Mostly yesterday morning seemed OK if a bit spinny, just up the incline where I’d normally push hard I was spinning like mad with relatively low resistance in the pedals.
It’s not the first time it’s happened mind and I did wonder following weeksy’s comments on the other thread if my trainer is pairing through the companion app or some such silliness on occasion and throwing a bit of a wobbly.
Either way, it’s all good, I really could do with learning to sit at 90rpm in a lower gear instead of dumping straight down the block and pounding along at 60-70 anyway so maybe zwift has realised this and just decided to train me like it or no.