For the green chimichurri: Combine the parsley, mint, oregano, canola oil, vinegar, red pepper flakes and garlic in a food processor and process until smooth.
Put the steak in a large baking dish, add the green chimichurri and turn to coat. Cover and refrigerate for at least 4 hours and up to 24 hours. Remove the steak from the marinade and place on a plate 30 minutes before grilling.
For the red chimichurri: Using a mortar and pestle, combine the parsley, olive oil, vinegar, oregano, chipotle, paprika, red pepper flakes, garlic and some salt and pepper.
Preheat a charcoal or gas grill to high heat.
Sprinkle the steaks with salt and pepper on both sides. Grill until charred on both sides and cooked to medium-rare doneness, about 5 minutes per side. Remove from the grill and let rest on a cutting board for 5 minutes. Cut the meat across the grain into thin slices, top with the red chimmichurri and garnish with parsley leaves.