I can't vote cause my choice is not on the ballot: "all of the above". I use fingers, popsicle sticks, tongue depressors, coffee stirrers, and at least 4 different style of "injectors", I lost count. The ones I like least are the syringes: messy to fill and slow in use.
I am not brand loyal when it comes to grease, either: at least 5 different brands and types..."the right tool for the job"!
The only place I don't go is using a brush (flux or other), and I can't say exactly why...it just doesn't feel right to "brush on" grease. Maybe if I baked more I'd find a brush more natural for "adding shortening" .