It isn't the bindings that give you the control you're looking for as much as it is the boot.
What you're looking at here is the crossover from old-school to new-school technology. Telemarks with the toe bails and heel cables have been around forever. The cables reduce heel friction, and do offer more down hill control, but there are newer technologies out there that pretty much render telemarking obsolete.
You're talking more about the culture of skiing when you start talking about telemarking than you are about superior technology. Telemarks were the backcountry ski of choice for many years, but AT skiing is quickly overtaking it on the Alpine skiing scene, and NNN and SNS have been dominating the X-country scene for years already because they are lighter, easier to use, don't ball up with snow and ice, and are cheaper, leaving Telemark as a kind of niche sport with a strong cult following. But even telemark is evolving more into AT, you'll notice that the telemark boots on the far right in the picture below are also dynafit compatible, so you could use those boots with both telemark or AT bindings.
As you can see from the image above the two styles of skiing both have their extremes but also share some middle ground.
If you're just getting into it, and want to invest in new gear, I would seriously recommend going with an AT setup if the type of backcountry skiing you want to do is going to be mostly looking for an untouched slope to ski down, but if you're more interested in long tours, but want more control, then go with a beefier SNS setup like the one pictured second from the left above. I personally am partial to the SNS system over the NNN system, because they have a deeper heel grove that offers more heel control in my opinion, even more so with the SNS pilot.
SNS (Salomon Nordic System) Binding:
Nordic Skiing interface comparison:
Your other option is to demo some more gear, or pick something up second hand, I typically try a new sport out first on used cheap gear, then if I really like it, save up and invest in something good. We live in a day and age where there are lots of technologies that favour slightly different styles. So who knows, maybe you're a tele-groupie and just don't know it yet and telemark is the direction you want to go. There are still newer technologies coming out for telemarking, like the NTN binding system, and I hear they're developing hydraulic knee braces that allow telemarker's legs to last almost as long as AT skiers on the slopes (jokes, telemarkers will always burn their legs out way faster than ATers).