The deranged take is arguing that these two are identical.
Kyler Murray = Joshua Dobbs.
Larry Fitzgerald = Michael Wilson.
Chandler Jones = Jonathan Ledbetter.
Gotha!
If you aren't going to compare the two based on the previous year's record, and instead want to pick all of the nits between individuals players on the 53 man roster, I don't know that you ever going to be able to compare coaches. Too many minute differences that can't really be weighed.
It's fair to argue that both coaches were brought in to coach a bottom win team. It is also fair to state that in the 1st two seasons, Kliff was able to produce a better record. Kliff was able to get the team to the playoffs in year 3, can Gannon do that? IDK.
Arians had a great run and has the highest winning % of a AZ HC in modern history. Whiz had a great initial run, and nearly was able to get the team it's first Super Bowl title in franchise history. He then couldn't figure out how to replace Warner and got fired.
I get being hopeful regarding Gannon (I am) but people are definitely putting the cart before the horse with him right now.