I would suggest the Bitcoin-Qt client. This means that you are solely responsible for your own coins. If you format the computer, or in some way delete the bitcoin folder, your coins are gone forever. Additionally, you have to sync all of the blockchain, and this can be quite time consuming, and so others rather such wallets as Blockchain. This is an on-line wallet that keeps all wallets up-to-date and keeps your bitcoins safe for you. In essence, the decision is up to you.
With blockchain.info you are solely responsible for your own coins. You must maintain your own backups of the wallet, otherwise if the website were to become unavailable your coins would be gone forever. If you lose or forget your password, your coins would be gone forever. The only two benefits you get from blockchain.info are access to your private keys from multiple locations, and eliminating the need to keep a synchronized copy of the blockchain. If you are just trying to avoid the blockchain sync, you should consider Electrum.