The most convenient are the mobile wallets, because you can use them everywhere easily. Of course they are not the most secure and risk free, too.
You should do your own research and decide what is best for you
Exactly different wallets have different features and you should choose according to your convenience I am using multibit at a moment but when I need to convert it to fiat I transfer it to localbitcoins.
Concern the localbitcoin. Is the site tested and trusted cos I don't want to get scam.
Localbitcoins has been around for a while now, I think the only people you need to worry about trusting there are the people your trading bitcoin with.
It is still more of a exchange (yes one without people providing info as it's users want to be anonymous in most cases). But read new's about storing on exchanges there are just to many bad stories and hacks to store on a exchange and believe your safe. Only one that I can think of different is coinbase due to it's insurance policy.
But you really should use a good hot wallet for short term spending. And a good cold wallet or hardware wallet for long term.