EVENT THREAD #16: CHRISTMAS 2017: Q & A AND STRATEGY THREAD: ACT II

Is it better to just tap and clear the funzos, as they appear, when playing the gift wrapping game or wait until more are on the screen. I just wondered if you wait until more are visible if they invade quicker so getting a better amount to tap and clear.
I've tried both methods and often get a couple extra if I wait, but you do have to be careful not to wait too long.