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Location: Bothell, WA
Depends on how many copies you intend on using it for. If it will be used extensively I'd go for 1/2" thick ply. MDF seems too soft for long term use.
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Location: Mid-MI
5mm luan works great for templates.
Mark
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Location: Butler, PA
I would likely choose plywood, simply because I hate cutting MDF.
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I tend to use 1/2 birch plywood. They do hold up for years. I have some that at 15 years old which I use a lot. It's light, easy to cut, and fairly cheap.
John
Always use the right tool for the job.
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Location: Lewiston, NY
1/4" MDF. Uniform "grain" and much easier to shape.
John
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Location: Carson Valley, NV
I've had good success with 1/4" tempered hardboard. Easy to shape and much more durable that MDF.
If you use plywood you have to deal with possible voids.