What I've learned after putting together two touring setups for myself is that most of the time you're going to have to settle somewhere. Tech bindings like Dynafit are by far the highest performance and lightest, but the price tag is a little intimidating. More affordable options offered by Salomon/Atomic, Marker, and Tyrolia all have areas where they excel and where they have room for improvement.
For instance, the Duke and Baron are so heavy I wouldn't ever want to tour anywhere with them, but the EPF is a very high performance, low-profile system. The Tour F10 and F12 are much lighter, and still very strong, but with the Marker system you need to remove your boot from the binding to enter tour mode, which can be a hassle. The Guardian/Tracker is lighter than the Baron and Duke and can be switched to tour mode without removing your boot, but the stack height is immense and the frame isn't as stiff as the Markers. The Adrenalin is lightweight and has the best flex profile of all the frame bindings - it allows the ski to flex underfoot most like an alpine binding while in ski mode - but it is also really tall, and it's got more plastic parts.
Then you have plates and inserts, and honestly I would stay away from those. The only advantage of them is that you can take an alpine binding like an FKS and tour with them. Otherwise, most of the touring plates like the MFD Alltime will utterly ruin a pair of skis in a few touring trips. They just remove all of the camber or rocker in a huge area underfoot.
Ultimately, you just have to tailor the type of touring binding you choose to the type of touring you're doing. Long trips where touring is the focus and your gear has to be lightweight and bombproof calls for the super expensive Dynafit or a similar tech binding. Sidecountry and resort touring should be fine with a frame binding, but you should prioritize your concerns about weight, height, lengthwise and lateral stiffness, and durability, as those are the main differences. If price is really a factor, good condition used models of all of these are generally an option.
Right now I have Salomon Guardians on Rocker2 115's, 187cm. It's a heavy setup, but I saved weight in the bindings, at the expense of some areas of performance I deemed less important. It's no use skiing a low profile binding if your legs are jelly from the hike up, I'd rather enjoy the walk and adapt to the taller binding.
