Easiest Number of heroes for each villain?

What would everyone suggest as the easiest Number of heroes for each villain?

In most cases, 4 or 5 (usually about the same, sometimes 5 is a little better).  For The Dreamer and Miss Information, 3.

There are specific win statistics in my signature.

Yeah, my answer is "5 unless Dreamer or Miss Info".

In team mode, the answer is less clear, though I think it's still slightly easier with more.