Your question is hard to answer without more information than you have provided. You have a faulty part. The sensible answer is to replace the faulty part. No need to replace the other end link if it is fine. Getting a new sway bar is not going to fix your noise if it is only being caused by an individual end link. A new sway bar could be a good idea for other reasons though.
Sway bars don't really effect ride quality in a straight line much. They do a little bit but not to a significant extent. That is the point of using a sway bar instead of stiffer springs. The sway bar stiffens the outside corner in a turn without making the car stiffer in a straight line.
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