1 Corinthians 10:4 And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ.
I'm going with what the Holy Spirit said.
That’s it in a nutshell.
You can believe God.
Or man.
In 1 Cor. 10:4 the Holy Spirit indicates the rock of the OT was Jesus Christ.
In Matt. 16:18 the Holy Spirit indicates the rock upon which the church will be built can be seen as Peter. Given that the Holy Spirit through Paul in Ephesians indicates the apostles are the "foundation" upon which the church is built, and given that the Holy Spirit in Isaish terms Abraham "the rock," I don't see why I should understand the Holy Spirit differently as to this verse.