No doubt tri's for me. I don't feel anything in the chest from dips. Might be the way my body is balance, as I see other dudes lean way forward on dips, which means they have more weight on their pecs with dips than I do. I'm almost straight upright, unless I would deliberately lean forward (could hurt my back, so I don't). I feel it mainly in my tri's, and also traps & lats a little.
Charles