how to choose a more secured wallet ??
The most secure wallet is hardwallets! There is no secure wallet except them. A hardware wallet doesn't cost a high amount of money, so, I think you should buy a hardware to live a safe crypto life. Though Myetherwallet is making some big changes to secure their wallet very much, hardware wallets always the boss. By buying a hardware wallet, you can store more than 500 crypto coins!
is the secure of the wallet depending on transaction fees ??
No, it doesn't.