I use a few different things. If Im playing with a piano, or a choir, etc, I get my A pitch from the piano and go from there. or I use one of the free apps. I haven't found one that doesn't work well enough for solo work to give me a decent A so I can tune from there. Or I use a snark. Im not sure which model. Ive bought 3 over the years. They work well in noisy situations. Ive never needed to see the cents. It will allow me to set it up or down to a different reference which is useful for early music and such. There was an app I had that would sound the desired pitch rather than hear mine. I liked that feature but I broke that phone and cannot seem to find the app again. in general I prefer to match a pitch that I hear rather than tune to a visual display unless tuning during a performance is likely to be needed when I must tune silently or nearly so. I did a theater gig once and had to retune my 6th string from e to d during a song. I had enough time but the rest of the group was still playing and if I remember correctly, they weren't playing something that would have given me the pitch I was looking for when I needed it. Thats where a clip on really shines in my opinion. other than that i prefer to get an a and go from there with my ear.
2013 Angel Benito Aguado
2005 Ramirez R-2