The flow rate (pressure) is always affected by the length of the pipe
regardless of pipe construction. The loss is due to friction. Pipe
construction will affect friction. However the text book makes no
distintion between any type of smooth walled pipe wether rigid or
flexible. This suggests that the difference is negligible.

or you need a better text book

mine lists several differences for

vinyl tubing smooth (assumes straight and round piece)
vinyl bubing ribbed (assumes straight and round piece)
pvc
abs

a few more though off topic of aquaria
copper
cement
galvanized
.....

even vitrified clay

--
Richard Reynolds