I don't play out, so this is only from a home user perspective.
My tuner is firmly attched inside my smartphone. I use the Peterson Strobosoft tuner, and I have for over a decade. It is as accurate as any tuner out there (with the prossible exception of the Turbo Tuner, which I am unsure if it is still being made). The app still has the same .1 cent accuracy as the stand alone Peterson units, but it is/was $9.99, and a decade later, I still haven't paid anything more for updates. I have added the sweetened guitar tuning pack, but that is a personal choice, the basic tuning app is just fine as is. it took a bit of time to get used to when I started using it, but its second nature now. I leave the cents readout on, and I call it good if its within 3 cents of perfect. I can also use it to check intonation on any guitars that I may be interested in buying.
I think Peterson got the Conn patents at some point in the past, after Conn pretty much went away. The strobe pattern is linear instead of rotational, but the actual note determination I think is the same.