IS Boxer offers a lot more then Keyclone, and is regularly updated/improved. But it is a subscription model. The key features which KC doesn't have are quick/accurate mouse broadcasting, instant window swaps, the flexibility of mapped keys (current window, vs all without current, vs any combination of toons, classes etc as the target of an action), repeater regions (which are great for healing) and automatic FTL (a strong assist method).

Keyclone is as good as anything for straight key broadcasting. And it is a one time fee, with a license that will last forever. I boxed with it for over a year, and love the product.

But I eventually moved to IS Boxer, it offers me more.

Decide what you want and need in a boxing software.