The pressures are going to be pretty constant, so the moving isn't going to matter. And anyway, it's not like there's going to be THAT much flexing or expanding of the hoses at the pressures we're dealing with. I say go with whatever's most convenient for your situation. I think I prefer flexible hoses because it gives you some adjustment room for moving bits and pieces. But going around corners may crush a bit, so you could put in some elbows to keep it from narrowing, pbpbptt, Chimera.