I'm siding with Chel atm here. The thing is, a lot of Arizona's abilities have to compete with Harpy Boost or the Treasure Box abilities. Stomp, Headbuck, Trample, Rebound, and Lasso? They can either be flown above or tanked by one of these respective abilities. And Arizona just has a worse version of the Treasure Box, with Counter, which still causes her to take damage albeit reduced. This is along with not having a true ranged option, relying upon Stomp, which has the aforementioned counters. Hell Chel has basically the same thing, along with the Saucy Shot, which even with its charge time, is a true ranged option at her disposal. And finally, Arizona's best avoidance ability requires magic, which can only be regained by Lasso, which I have talked about before. Everything Arizona has, Chel either also has, or can straight up counter it, and has better options overall. Chel FTW