The aesthetics are subjective, and I would fall on the other side of 31seahorse. I personally prefer the look of 3-5 coats of gloss over 3-4 coats of the Natural Teak (# of coats dependent on imperfections and the amount of sanding between coats). To my eye the gloss adds depth and an illusion of clarity. It can't hold a candle to a good varnish job, but for my skill set, Cetol is a much more forgiving application and sets the bright work off differently than the base coat alone.
From a utility standpoint, the gloss finish provides some differences (in my limited experience). When last refinishing our bright work, I finished a single coaming with 3 coats of the natural plus 4 coats of clear gloss and the other coaming with just 3 coats of natural teak. I found the gloss "smoothed" the finish out and repelled water/dirt better, while also curing to a harder surface after a couple of weeks. The gloss gave a noticeably slicker finish that seemed to be easier to clean off, but it was also slippery when wet so I wouldn't use the gloss over any surface that may require traction. After a few weeks to evaluate I decided to finish the rest of our bright work with ~3 coats of natural and ~4 coats of gloss. For upkeep, I've found that just scuffing up the gloss layer and reapplying a couple of coats is easy and effective. I have no long term comparison on maintaining just the natural teak vs natural/gloss.
All this being said, I did not provide an appropriate 'control' comparison by finishing a section with just 7-8 coats of the Natural Teak. I don't know if the observations above are due to the gloss formulation or simply a result of using more coats when including the gloss than the natural alone.
Suggest you try both on a smaller surface of your boat to see which you like better.
EDIT: just looked at my maintenance log and the original application was in 2010. At the time I noted issues w/ air bubbles when applying thick coats to the hatch boards so I changed my technique a bit and applied thinner coats to the coamings and other bright work. All work was done with 1" and 2" foam brushes purchased off of Amazon.