I would use the clear vinyl tubing you eliminate 90's but i like it better then pvc (make sure you use clamps. when pvc is done right it looks clean and neat. I guess its preferenc really
for example if you look at the drawing i drew with the setup on the left with all pvc you are looking at 3 90's which is 270 degrees in bends which factors into alot more head pressure then the one on the right with one 90 degree and whatever in the flex which shouldnt be that much and is easier to work with and if done right still looks nice, if done right