When I first started I dove Quattro Pro's. They're still in the dive locker in fact, and my grandson now uses them. My fin of choice for a long time were Turtle's and I still have two pair that I should probably get around to selling one of these days.
When I switched from doubles to a rebreather I found I was a bit foot heavy and on the advice of a friend switched to the lighter Slipstreams. Initially they gave me leg cramps but that resolved quickly. A buddy has the Hollis's and I've tried them and liked them too but like the Turtles they are heavy -they are also BIG. Dive Rites have their fans and Jets have been popular for a long time of course.
As this indicates, a recommendation for a "best" tech fin is hard to make. Generally speaking they are all fairly similar, the primary differences being weight and stiffness. All will perform the various kick styles necessary for "tech" diving ie: frog, modified flutter, back, helo turns, etc .
I suggest you try out a variety if you can because personally, I prefer some over others and you probably will too. Most every pair of fins I've ever bought I bought used off the forums or eBay. At the price you will pay for used fins you can buy a pair of each and resell the ones you don't like. Even if you lose a bit of money (which is unlikely if you shop wisely) you'll probably still spend less in the end than if you'd bought one pair new. And no matter which fins you get the straps should be springs.
Gary