I think a well cared for vinyl top should last 10+ years. It really depends upon how often you clean and treat it, and how long it sits under the sun, rain, hail. I’ve never had a canvas top, but my understanding is that they are more difficult to keep clean and looking good.

Does your statement “Cost?” mean how much to replace with a new top? A new Robbins vinyl top with rain rail will set you back close to $600, but there are many cheaper options, (starting from ~$175 for an eBay top).