Rosin is key in getting a good bowed sound, so don't cheap out on this key ingredient to success, it can last a long time - and isn't very expensive. In fact, some bassists carry two or three different cakes just in case the environment makes another consistency better for that particular situation. When the humidity is high, the more powdery, harder rosin is usually best, and during very dry periods some stickier stuff may be needed.
Carlsson Premium Swedish bass rosin comes in an easy-to-use foil cup, and has a relatively neutral consistency. Here in the humid coastal area of Southern NJ, I find that it works equally well in the hot, muggy summertime, as well as in the drier, colder winter. It has been Bob's first choice for decades now, and a cake of it is in Mark's gig bag, too.
New players: I include my tip sheet including details on the care and usage of rosin.
I switched to Carlsson's after a melted rosin incident (the stuff in the orange tub with the ketchup cup) left me cleaning out my bow case pocket. Carlsson's provides good grip is stable in the summer and winter. It leaves very little dust. I don't find dust anywhere other than the strings and bridge (the other stuff flung little sticky beads of rosin all over the place).