My kicker snap accuracy is TRASH. Power readings are all over the place. If you have a legit power meter I would always use that. I’m sure some kicker snaps have more accurate readings but in general I believe wheel on power readings are inferior to normal power meters.
Might be interesting to pair both at same time to compare readings. For me, kicker snap reports 150 watts whereas power meter shows 200 watts. Huuuuge difference