Properly applied Honey Teak (base coat) will last up to and beyond 10 years. HT requires a slop maintenance clear coat every year or every two years in northern areas. It can be 'finished' (flat sanded with 2000 then hand rubbed or powerbuffed) to 'beyond' or equal to a PRIME varnish job. Only downside is its expensive but when you amortize over the nearly 10 years it comes out at the cheapest in money and labor. Honey teak must be applied THICK or you will get premature failures ... but is easily repairable.
Epoxy over teak then varnished on top will eventually fail in a relatively short time from two mechanisms: 1. moisture permeation through the wood (turns the teak surface eventually BLACK) and 2. UV degradation ... and its a royal PITA to remove and sand/bleach the teak. An epoxy base varnish job is almost impossible to repair and the teak needs to be entirely stripped and reworked.