Neither of those ^^^^ are tubing benders.
The roller will make LARGE radius arcs in lightweight materials. (A 90° bend will take several feet to accomplish.)
The pipe bender (as the guys said) is for pipe and easily worked materials like electrical conduit. (It will deform, crush and kink tubing.)
What you need depends on what you plan to bend. If you want a real tubing bender, there are many choices... JD2, Mittler Bros. etc., etc. (I have a Hossfeld.) None are cheap but produce quality, uniform bends in otherwise "difficult" tubing.
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