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Leave the drains closed and drain when full. You will get the feel for normal draining once you've done it a bit. I've tried both and leaving the valves open causes a number of problems; things don't fully flush from the tanks, ie; any tiny bits of solid anything, scum builds up all over the place and it is difficult to get out. After leaving ours open for 1 1/2 months on a trip (first/last time doing it) the sewer hose was very heavy even when drained...it was full of scum and I had to power wash it to clean it....it split on the next use. It's also hard to control the smell because of the build up.
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