Memcache vs APC for a single server site data caching

Question

I have a single server site thats pushing 200k unqiues per day, and the traffic doubles roughly every 40 days (for the last 5 months anyway).

I pretty much only plan to

Answer 1

It's almost impossible to accurately predict which would be faster. I would run tests with both in a development environment with similar data.

When performance is of importance, always use a profiler.