Hi Csüllög,
There are no rules….
but I, for instance, tend to make large shape-defining Bevels destructive (it is faster and I think that I won’t be changing them later on) and smaller Bevels, that are really important for how the light plays with edges, which is something I might want to change later, when I am in the Shading/Lighting phase, I tend to do with the Bevel Modifier. And sometimes I make a mistake and make destructive Bevels, where it would have been better to use the Modifier.
You’ll get a feeling for when to use what during your modeling journey; each time you use the wrong one, you’ll suffer a bit later on and will be less likely to make that ‘mistake’ again.
