what application do you use for usage bitcoin ?

[Bitcoinsummoner]

Coinbase if you are dealing for daily transaction much better is coinbase because they are not asking for fees
But if you really want to hold bitcoin for a long time you can try to use electrum..

[CraigWrightBTC]

i mean for iPhone and macbook ? what web site is better to use ?

I think many websites, application for save bitcoins, if what do you mean is wallets of bitcoins and it had been answered above me. I think it is clear, but the problem right now is which are the most suitable for you.
You can try by your self, personality i used mycelium wallet and it is good in my experience.

[Kray]

I use blockchain.info for my main wallet. Suitable for my android, and apple product

[jtipt]

Since I use a android phone I use mycelium for quick access and for spending bitcoin, most of Web wallets are unsecured as all your coins are on their server. I also have got electrum on PC where I prefer storing large amount but not too much IMO if you have over 5 BTC you should store it cold in paper wallet or hardware wallet like ledger.