depends what you're most comfortable with. if i put my mind with bryce booleans and terrain modelling, i could probably get the results i want. but i use bryce as a means to an end, so in my case it's ridiculous to use the app's modelling abilities when i can whip somehting similar out in 5s in wings. the point is what you render for. if you're a 3d pro, or like to think you are, then specializing in a number of apps is important. if you're just a hobbyist, then use whatever makes you feel happy :) great work with terrains, btw :)