Teak. Silver it or slave over it. Honey Teak and Bristol Finish are, I believe, 2 part polyurethanes somewhat like varnish. Then there is actual marine varnish such as Pettit, Interlux, Epiphanes, Le Tonkinois. There is also Cetol Marine, which is like a lightly pigmented thin-film paint. Semco teak sealer is a watery, lightly pigmented protectant. And finally teak oil.
I like varnish, but it takes 8-9 coats or more to give the lustrous look I like, I only ever get to the next-to-last coat due to dust, drips, sags, etc. and it needs a new coat every year. I tried Cetol once, 3 coats, and within one season of mid-Atlantic sun, it started to flake off, which is a total failure compared to others I know who like Cetol. (I did wipe down teak with acetone, so I don't know why it failed so quickly.) I have recently scraped the Cetol off, and I'm going with teak oil in the schedule of 1 coat a day for a week, 1 coat a week for a month, then 1 coat a month for a year, and see how it goes from there. I know someone else in FL who has been through just about everything else, and swears by Semco. I haven't used it myself, but recommended it to a friend in NC who just bought new teak deck furniture. I think he's been happy with it.