Hardest Keys to play on a C Chromatic

Hey there guys,
I wanted to ask what are the more difficult keys to play in when using a C Chromatic Harmonica?
I am looking to move to a Chromatic and currently most of the songs I play harmonica on are in A & G.
My music theory at this point is relatively limited, (hoping to expand when learning the chromatic)… but I just thought I’d ask now which keys to look out for in terms of difficulty.

In addiction to that… should I be looking at a Chromatic in G etc…
Thanks in advance