'Better' is going to be a matter of opinion probably.
The free tuners commonly used are
Bill Farmer Tuner (Windows, Apple, Android) https://billthefarmer.github.io/ctuner/
PitchLab Pro (free version)
Da Tuner lite (v 3.81)
I've just spotted that Peterson also does iStroboSoft which is a strobe tuner for your phone ($10).
The Bill Farmer tuner also does strobe but I haven't tried the strobe yet.
I can't see strobe is going to help much for tuning tremolo, unless you can set the offset.
The free tuners commonly used are
Bill Farmer Tuner (Windows, Apple, Android) https://billthefarmer.github.io/ctuner/
PitchLab Pro (free version)
Da Tuner lite (v 3.81)
I've just spotted that Peterson also does iStroboSoft which is a strobe tuner for your phone ($10).

iStroboSoft | Peterson Strobe Tuners
www.petersontuners.com
I can't see strobe is going to help much for tuning tremolo, unless you can set the offset.