If you are not experienced with a particular product, you are best to begin with the least abrasive product you can find that actually removes the scratch. I recommend first starting with a cleaner/wax. Such products have very little abrasive and some solvents that can remove anything on top of the paint. If that doesn't get it, then move on to a cleaner-wax prep product, if that doesn't do it, try a swirl mark remover and then a polishing compound and only last a rubbing compound. The key thing being to remove as little of the clear coat as possible to remove the scratch.