That's a great question...

I differ from some of my Presbyterian brethren in that I do not conclude absolutely that the Bible outlines a certain normative form of church government. So much is clouded by the presence of Apostles.

But...

Paul's effective conflation of the offices of presbyter and episcopos in Titus 1:5-9 seems to rule out episcopacy.

But by the same token, there is little real difference between a properly instituted congregationalism and presbyterianism except for the responsibility of the local session to a larger authority (the presbytery).

Both can be seen in Scripture though I have to admit that I believe the Presbyterian form to be the most consistent.

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Michael Gridley
Presbyterian in non-communicant attendance at St. Thomas Lutheran (LCMS),
Eastpointe, MI