It doesn't make a difference at most schools. If you have no research experience whatsoever (not required for applications), then it might be useful for more research intensive schools like U of T. It also might help if you're looking to get a reference letter.
When I was going through the process, most of the students that I talked to were "research lol, i'd rather do X". Essentially, do it if you feel like you're going to enjoy the process. If you'd prefer to do other things, then do that instead.
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