I have used custom fitted covers for over 30 years. They are more costly to purchase than shrink wrap but they can be used over and over. 10 to 12 years typically. Shrink wrap is one time use typically. Some people do reuse it but that’s a whole other process and conversation about how to do that.
shrink wrap can be recycled To reduce the waste volume.
With shrink wrap it’s essential to get proper venting or you end up with mildew all over the interior of your boat.
There are companies that make what I will call generic fitted covers. Can’t speak to them because I don’t have experience. We have a local company that custom fits them to each boat. The last cover cost around $2700 but it expected to last more than 10 years. It’s made of breathable material so mold / mildew isn’t a Concern. Best part is our guy has a service where he puts cover on in the fall, takes it off in the spring, inspects and repairs it, and then stores it for thr summer. So I don’t have to deal with it. In my case it’s a big cover and storing it (we moved into a condo a few years ago) would be a problem for me.
Blue tarps are a nightmare. Had a Catalina 34 that I tried to use tarp on. Took 2 people over 8 hours to get it fitted and even then it hardly made the winter. Due to medical issues, the next year I couldn’t do the tarp and searched and found the canvas cover. I could put that on working alone in an hour.
so here is a picture of what I have.