I use the white one that they use for gap filling and insulation.
I tested it out with the Great stuff in comparisson with the silicone coco peat technique...Soudal works better at holding the silicone and cocopeat combi...GS leaves patches of white here and there as the silicone just drops off

well thats just wat i experienced...now i only use Soudal whites...Great Stuff items are only the Pond and fishpond because its black and dun need to do much concealment