Hands down, you need both tools along with poser. A paint program is also highly recommeded. The more tools you have the more options you have. My aresenal contains every version of bryce, painter, RDS, Carrara. The freebie modelers from alias, cinema, and strata. Poser 4 through pro and 5. Many many others. Its expensive but well worth the investment to get as many of the tools as you can. If you are lucky enough to have a lab full of computers Bryce 5 lightning makes rendering movies or scenes really fast. Would love to see Carrara beat that!