Either tool is good but you do not want a ratcheting lug crimper if using it on a boat. You'll have to trust me on this one. I like the FTZ tool and this is how you use it: Making Your Own Battery CablesThanks, Maine Sail.
I had planned to borrow a friend's lug crimper but it turns out he has the Ancor one (http://www.amazon.com/Ancor-702040-Electrical-Professional-Crimper/dp/B000NI3EW0). So I will take the plunge and buy my own. I plan to use FTZ Power Lugs since they are available at Fisheries for a good price.
Two questions for you:
1. FTZ Correct Crimp or QuickCable Hex Crimp?
2. Ratcheting type or not?
The QuickCable crimper costs a little more but on a $200 tool it's not enough of a difference to matter.
I think when doing a single crimping with the diamond crimp tool you actually get a nicer finished lug with on a hex. With hex I make 1 crimp and rotate then make a second and it gives a BEAUTIFUL crimp...
Double crimping is make crimp, rotate lug 90 degrees, crimp once more in same spot.