As a kid we (my Dad) had an all varnished teak sailboat, (Teak Lady, hull #1) and I mean ALL varnished, from the waterline to the masthead. This was before UV blocking varnishes, and he and I spent so much time varnishing instead of sailing that he sold her and bought a Thunderbird 26, because it would have broken his heart to paint her white. He was a fanatic about his yachts always being bristol in every respect.
As a teenager, I worked in the Kettenburgh yard as a varnisher, and I've spent many many hours on my own boats since then with a camel's hair brush in my hands. This boring history is only to say that I've seen some varnish a time or two.
I've been using the new Epiphanes varnishes after reading the glowing praise heaped upon them by practical sailor's testers, and they are by far the best I've seen yet. I haven't tried the Bristol products.
For high traffic areas (the steps into my salon, for example) I top coat varnish with clear imron or awlgrip. Those linear polyurethanes are tougher than nails, and really hold up to foot traffic.
There's no big secret to getting a deep, lustorous varnish job, regardless of what brand of varnish you use. Remember, no whiz bang product will ever substitute for careful prep, absolute cleanliness, and at least 12 coats. That "deep enough to swim in" look begns at 30 coats.
Quit talking about it and get to it.