Assuming that you’d want the option that would give you the most money, the best option would be to get a penny doubled every day.
The geometric sequence for a 30 day month with this pattern is:
1, 2, 4, ..., 131072, 262144, ..., 268435456, 536870912
Contrary to what one might believe, the penny option gives you more money. Since the final value in the 30 day month converts to $5,368,709.12, that is more that just the plain Jane $5,000,000.
I hope this helps! :)