The booster is softer and bulkier than the dip. It is therefore mainly used for baits, ie boilies, pellets, Method, Zig or PVA mixes, particles and the like. It is also designed to achieve the same flavoring boilie as the boilie you're catching.
Dip is designed primarily for highlighting baits. It is extra strong and contains components that are released from the bait at different speeds, directions and intensities. The fish are thus attracted to the bait from a wide area and from different layers of the water column.