Neither, I think. Its important to remember that not all refineries are created equal. Not every refinery has the same complexity. The latest Oil and Gas Journal Refining survey has Reliance rated at 130,000BPD of FCC capacity with a crude capacity of 660,000BPD. ExxonMobil Baton Rouge is listed as having 229,000BPD FFC Capactiy, with a total crude capacity of 501,000BPD.
The largest listed "refinery" is the Paraquana Refining Center in Venezuela at 990,000BPD crude capacity but with only 166,000 in FCC capacity. Its a "simple refinery design to quickly upgrade product for shipment. Baton Rouge is an example of a highly complex refinery aimed at end market products. The Venezuela center is actually three refineries linked so its a bit of a strech to call it the largest.
That being said, the OGJ survey is for capacity. I don't know what the single biggest unit is in those refineries.