I thought training outside will be far better. When I am not training (doing group rides) usually I produce more power outdoors but at that time, I am with many riders.
For indoor training, I do not use ERG mode. (mostly I ride with Zwift bots as they have bots for most w/kg)
My power meter (favero) tracks relatively close to Wahoo
The wind here is around 15 to 19 miles per hour these days.
And yes my cadence drops outside. Indoor with SST I can mention 85-90, outdoor yesterday, it was 68.
Sometimes I feel like lack of motivation is solo riding (that zwift bot, I can do SST 1 full hour)