obviously the bigger they are the less our gonna cash, but the bigger payout you'll get if you do.
depending on my mood, I'll play 45 persons, when I think I might want to play for a while. But usually like to multitable the single table ones. People enter those to play a faster game and seem less patient to me.
Forgot to mention that the smaller tabled ones will have less swing on your roll to. Bigger ones, you might not cash much for a while, then hit a couple in a row. Smaller player numbers mean more stable swings IMO.