I have used both in my bh. I use glayzer right now. For beginner Rozena is good for fh but for intermediate, glayzer is way better. Rozena is too soft for real fh. With good technique glayzer is spinnier and faster while having a little worse control of course. If you have decent technique and some real fh loop, take glayzer. If you are beginner or developing your basic loop, take rozena.