Welcome aboard.......What kind of conditions will you be going through?....Brush, woods, desert, or what?......It does make a difference for what you choose
Historically folks have made a frame and used shrink plastic, the various poly's, and glass. Each has their own drawbacks. If one uses the poly, folks complain about all the small scratches that cut down vision with direct sunlight and yes when driving through brush one does get a lot of scratches that wont polish out........The shrink stuff has their own set of problems, but golly, the price is really right. Border Collie has a really good solution and you might do a search about that, and really all of these.
For me, glass works just fine; but it does break. Ask my hired hand who drove straight into a branch and it went straight through the glass. Yes, the replacement is just as high dollar as the original; but it cleans up nice, really is resistant to brush and driving through the woods, and is easy to clean without using some kind of polish or rags........