I was a long time stages user and used it with power match vs my elite direto.
my 2 cents.
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try to stick with 1 source of power, inside or outside, that way TSS/power pbs etc. are all taken from a single source, I think based on forum experience its quite common for trainers and power meters to have some discrepancies.
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After using a stages left only and then switching to a quarq, I had a 20w drop off due to the left/right imbalances unique to me. It’s not a bad result, but it takes a while for your brain to recalibrate to seeing a lower number etc. The good thing from my stages was that it was consistent to itself which is all you really need.
If I were to do it all again, spend a tiny bit more and get a dual sided/total sided power meter. luckily now assiomas/quarqs are not that much more vs a stages. It’s a long term investment and you’ll use it almost daily, so just go for the best!