I own at least 5 chain tools, maybe more. The best by far is the Shimano TL-CN32, the one with the rosewood handles. It is a pleasure to use on any chain. It costs about 125 bucks.
The WORST chain tool by far is the campagnolo 10 speed chain tool. Even tho it's beautifully finished and fits into your hand with the heft of an HK 9mm, it is a complete piece of junk. The pin folded over on the very first use - like cheap pot metal.
Bainbridge Island, WA