Hello friends!!!
What Wallet of ethereum, they use more
and because?
To be honest MyEthereum wallet is popular by many people, but you will have to care for scams and for your computer to be cleaned from malwares as every time you use it you will have to expose your key one way or another. other thing is to care for malwares that are known to switch your address that you copy on your clipboard and thus you should check every time the destination address.
You can even generate offline private and public key pairs and receive tokens/ether to that address and when you want to you can spend them.
Another popular place to store ethereum and tokens are hardware wallets.
You also have some mobile apps or some multicoin wallets out there that support ethereum and enable you to spend all of your tokens/or some of them