It depends on what is important to you. Glass protectors are typically tougher than plastic ones and will feel smoother to the touch, more like your original screen, but be more expensive. On the other hand, glass protectors are thicker than plastic and you may not like the way it looks. Also, sometimes cheap glass screen protectors will have a poor coating, which means that it might not feel as smooth as your original screen, attract fingerprints or sometimes not register your touches correctly at times.