As i truly say for me the all the boosters are my favourite because they help us in those levels when there is hard to pass them. But the boosters which i could choose as best be a UFO and the mixer of color bomb along with strippers and candies they together make a BOOM!!!!! They are truly "DIVINE". So my favourite wouldโฆ
If i would be getting an opportunity i surely be righting optio D. As according to me there might be uncountable or i may say infinite switches๐๐๐๐ ~~So i greatly be going for option D~~