Both the HW80 and the TX200 are as accurate and powerful (sub FAC) an airgun as you would ever need for bunny bashing.
Both are built to very high standards and both are a pleasure to use. I would imagine if you put it to a vote, it would come out 50/50.
It comes down to what type of airgun you prefer to use. Break Barrel or Fixed Barrel - under lever.
It comes down to personal preference, so you would need to try both out.