Always after. I have a nice park on the way home from the gym I either run sprints on or just go for a 4 mile hike. I just don't have it in me to lift afterwards. Of course I live in Houston and have had a 7 lb weight difference after my cardio session so there's no way I could perform at my peak after that amount of fluid loss.

Plus I don't want to carry a mop around the gym with me.