Is it better to over size your pipe or undersize your pipe?

Here is my predicament.

I am slowly working on my plan for my pond now, but I can expect I will have
it dug before I am ready to buy the pumps and other gear. I plan to shop
around a bit. So I want to run the pipes for the skimmer and the bottom
drain, etc., but if I have not decided on a pump yet, I figured this would
be a problem.

Should I just run twin 2 inch PVC pipes and use both if I need the 4 inches
of bandwidth, and cap one if I don't?

--
BenignVanilla
tibetanbeefgarden.com
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