For me, it's the Jaffa Cake followed by the Chocolate Bourbon, followed by the Ginger Nut.

Hobnob and Jammie Dodgers are honourable mentions.

I've never had Garibaldi, but it looks good from here :)

Ginger Nuts were my Grandma's biscuit of choice. I think my Grandad had those polar bear mints instead of biscuits (yuck!) Very fond memories of both though :)