Some in exchanges, some in mobile wallet and some in hardware wallet. I diversified my coins, it is safer instead of holding all in hardware wallet.
I'm a bit like that, I have small quantities all over the place. I don't fully trust exchanges, but also I don't fully trust myself not to do something stupid if I have everything in my own wallet. The problem with this approach is keeping track of where everything is.
Preach!
With all of the issues that have come up with exchanges, it is risky to have all of your $$ in one place. Some exchanges have more liquidity than others, so it is valuable to diversify not only your holdings but also where it is held.