T-bone/porterhouse. The bone gives the steak more flavour, and provides something to grip with your tongs to turn the steaks on the grill. I marinate steak in a mix of oil, red wine/balsamic vinegar or lemon juice, crushed garlic, dijon mustard, crumbled rosemary, and a little salt and pepper. Steaks as tender as t-bone or porterhouse don't require a lengthy marinade, only 1-4 hours. Yum!