Even though I haven't killed anything with it (not for lack of trying) I'd have to say the 340. But I also have a 270W & 240W I haven't shot at all yet, so we'll see. Local gun club has ranges closed for reconstruction for a few months now, and that's the easiest place for me to go.
My experience with below 30 cals is not the same as many here and otherwise. Just a few deer but I never got the "drop on the spot" that others seem to get despite similar shot placement. I don't understand it but that's my experience. I like it when they don't go anywhere, quick and humane. I have gotten DRT with the 30s and above, sooooo.