I can recommend EXODUS
I have been using it for over 12 months without issue.
There is also the function to trade within the wallet via
SHAPESHIFT because Exodus also supports Bitcoin, Dash,
Litecoin along with about 8 or 10 other altcoins.
They describe their system as a
Multi asset walletSecurity is good also because you have access to the
private keys and can run a scheduled backup of the
system also.
There is one caveat though, it is not open source, the
developers do not release the coding, they control that!
Check it out >
https://www.exodus.io/