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Odamex, is just join a server, much like most modern FPS games out there. Personally, I like Chocolate Doom for co-op, as it lets me play from beginning to end, and I can choose the map a friend and I left off on if we stop playing.
Not putting down Odamex, since it is my favorite client for general multiplayer.
Edit: Your best bet to un-modified classic Doom co-op is Chocolate Doom, as this port is the closest to the original DOS game.