Is opening the Myetherwallet account using Json File more secure or better than using the Private Key itself? Thanks for your respon.
Yesterday, there was a post warning people about accessing myetherwallet. Here is the link: https://bitcointalksearch.org/topic/caution-myetherwalletmew-hijacked-april-24-2018-3386300
If I were you, restrain from opening myetherwallet. We don't know how true these news are but it is better to prevent loss from happening. MEW is not completely secured and expert hackers can still hijack it. If you really want a good wallet, you can go for hardware wallets such as Ledger and Trezor, although it might cost you some money too.