The biggest difference for Protestant denominations that give what they call communion is that they give symbols however, nowhere is to be found the word symbol in John 6:53.
In my understanding, Jesus teaches you that you need Holy Communion for eternal life John 6:53-John 6:58.
Protestantism teaches you that symbols are Ok, or that words are Ok or that nothing is ok.
Now you decide to listen to Jesus or to Protestantism.
I believe moving from Holy Communion to symbols, words, nothing is a great blunder, mistake of Protestantism and raises many eyebrows regarding theological qualifications of the reformers. Back then being able to write and read was a major accomplishment, however this would not qualify somebody to come and pick from christianity what he likes. They may had it right in some aspects however for a NEW religion they need to have it right in ALL aspects since people can not loose eternat life, I say again, eternal life because of a blunder. They affect the destinity of their children for a long period of time by choosing a religion, so it is a serious issue. Not want to go that to have Holy Communion may be needed that Holy Spirit to come and make Holy Communion. So Apostolic succesion, priest ordination, good teachings may be important. Not only that but nowehre in the bible says about reformation and that people can start Churches.
See, all of us go to doctor, get best medication to extend our life with months, years, decades and such. This is what doctors can do and this is not something to overlook. Now we are speaking about extending our life with eternity. Why should we settle for symbols when Eastern Orthodox Church has what Jesus said. Why would us settle to a picture of a car, a symbol of a car to do a trip when the actual car would be available.