I strongly recommend Electrum. It's very lightweight and very intuitive.
Just make sure you take good care of the 12-word passphrase. And watch out with adding your own private keys to the wallet, since the 12-word passphrase won't recorver those additional private keys.
I also recommend to use Electurm very easy ,very light .and you can consider bitcoin core as a full package client in both situation make sure to backup& encrypt your wallet.dat .with a good anti virus installed in your computer if you intend to use windows.