According to wiki, bonus garden gives 90 tickets for 80 stamina. Second stage maps won't improve the ticket/stamina ratio too much, they all give (number of tickets= stamina needed x 0.55), which is almost the same as E-3 with 21 per 40, being a 52.5%. So it al will come down to the bonus garden.

Ps:Nitpicking a bit on my part, but i disagree with the lecture used above to evidence that second stage farming will be better. I agree it will be better to farm E-8 due to pure numbers, but the difference in tickets gotten shouldn't be so great unless garden chance is a 100%. I think a reasonable chunk of the difference comes from people voting at the end of the event rathen than just farming capability. In the end, we can't assume that people used they tickets as they got them, so it's not a good comparison.

Edit: Got ninja'd. =D