If you are talking about toilet supply lines, then rigid ones are more work than braided flexible stainless steel (over rubber pipe) but if done properly can look much nicer and last just as long.
I wouldn't worry. If someone wanted to fit a nice shiney chrome-plated one for me, I'd chuck my cheap brass-braided line out of the window without a second thought.
Part of me misses a beautifully shaped chrome supply line.
And there are some braided supply lines which are not even metal braids (the Orange Big Box store sells them). I'd avoid those.
See what pipe they intend on using and if it is pretty.