There's just no way to cut housing that will not crush it. Some do less damage and cut in ways that make it easier to re-form the ends back but unless you use an abrasive cutting wheel in a Dremel or similar you're going to crush the housing.
The housing cutters sold by the bike tool companies do a nice enough job that only minimal fixing is needed for the end. But the best ends still need to be ground or filed square and clean to get the very best feel from your brake or shifter housing installations.