Well, Bonk, to be honest, I have a variety of electonic tuners that I've collected over the years, but my favorite is my Korg TM-40, for two reasons.
1. It let's recalibrate the tuner from 440 Hz (middle C) to a higher or lower frequency, which can be helpful when playing in a different place than normal, with say piano accompaniment, and the piano's middl C is at 436 Hz. It may not sound like much, but I can hear the difference.
2. It has a built in metronome, so when I'm learning a new song or riff, I can learn it a bit slower than the way the music's written, to get the memory in the fingers, then speed it up gradually until it's at speed. At my age, this can be helpful.
I hope this helps.
Mike