BEFORE I worked for Oxford Products, I used to favour the Oxford Stormex, but have had quite a few come back with peeling seam seal tape (although compared to number actually sold, maybe not that many). Seems to be caused by leaving in strong sunlight (?) judging by the faded look of the problem ones.
Used to sell a lot of Held covers at my last place, so could be a good option, quality looked ok, but haven't used one myself.