We had lunch at DOC & dinner at DOP (same chef, Rui Paula) while in Porto and the Douro region. Both were great, the food excellent, the service attentive.
I would recommend DOC slightly ahead simply for the location. What a beautiful setting, along the Douro river, in a architecturally wonderful building inside & out.
The only downside to DOC is driving back, which limits greatly the wine you can have with your meal. It’s a good 2.5 hours’ drive back along challenging roads.
We would gladly eat at both places in a heartbeat.