In one of the engines I build I can get the cyl in either chrome or nikasel. I have found the chrome to resist scratching to a far greater degree. The chrome plated ones rarely develop scratches from the dust we tend to suck in flying, but the nikasel picked up many scratches very fast. Also I have had a few people score the pistons and if it was in a chrome bore the cyl was undamaged unless it went too far, were the nikasel was damaged right away. Just my experience with airplane engines. In other applications it may be different. I have never had either let loose from the aluminum.