What are the TOP 5 online wallets ?
My advice : Don't use online wallets for long term savings.If you need to do transactions regularly and you're too lazy to open your deskop wallet for sending a few satoshi's,keep a small amount in online wallets.The following list is based on the wallet's security/reliability/user-friendliness/popularity
1.Blockchain.info
2.Xapo.com
3.Coinbase
4.Hive
5.Greenaddress.it
Hive is no longer operating... Here is a list based on stats and not guesstimates.
Largest (according to Alexa ranking, which is accurate considering how well these wallets rank. Alexa is pretty accurate up until around the 500k mark (past that it means low traffic and harder to gauge against similar ranked sites)):
1. Blockchain.info
2. Coinbase.com
3. Xapo.com
4. Circle.com
5. BitGo.com
6. MoneyPot.com
7. HaoBTC.com
8. Greenaddress.it
9. CoPay.io
10. Coinapult.com
11. airbitz.co
Note: Blockchain and Coinbase and Xapo are by far the largest 3, leaps ahead of everyone else.
Also Note: I might have missed a few, these are the only ones that I have either heard of or saw on Bitcoin.com.