I have tried both religiously over the years. One advantage of the glasses is that they work for screens that you don’t have software control over - how often

I have tried both religiously over the years. One advantage of the glasses is that they work for screens that you don’t have software control over - how often you might look at such screens depends on your particular circumstance. How often do you do image editing? Another advantage of glasses is that it only affects what you see and you won’t get questions from others about why your screen looks all red. One advantage of software like flux, redshift, twilight, etc is that you can customize its schedule and get really granular. They both work - which one is better just depends what for. If money is tight the software is more than sufficient and a great example of why FOSS is awesome.