Blockchain.info. I got hacked a while back when I used the simple bitcoin wallet. Lost about 170$ worth at today's exchange rate. Decided that blockchain was the best option as it's much more difficult for someone to steal my funds and it's a lot easier overall. If i ever seriously invest, a cold storage paper wallet via Armory is what i'll be using.
Is blockchain.info releiable for large funds too ?
Yes blockchain.info is reliable for large funds too. A few of my friends have a couple hundred btc on their blockchain wallets
Not trying to sound harsh here, but just because something seems currently reliable doesn't mean it actually is, or that it can't change without warning.
Unless they spend and receive dozens of bitcoins daily, no one needs to keep that much tied to one online service (and really, I'd question it even then.) Maybe if they have several other wallets, including paper, with just as much in them, but otherwise that's an incredible risk.
If they have no other balanced wallets, I would
strongly recommend suggesting to your friends that they diversify into a couple of other wallets too, including a cold storage (likely paper) wallet, with plenty of backups of each, all secured. They will most likely thank you for it later.