I want to do well in endurance (trail running) but there is no way I would do a cardio workout before the weight workout. In fact, I don't even do much cardio at all on weight day because cardio after weight training is just junk miles of questionable benefit. My long runs are catabolic enough so why hurt those muscles so soon after the weights? I suppose if you're super competitive endurance, then maybe the right decision is to drop weight training altogether to get quality training miles 6 times a week, but for mere mortals like me, I like getting muscles that help me burn fat while sitting at my desk job and I still get to do those important long runs every week.