IFS for me personally. I can always upgrade to a long travel set up in the front. I was back and forth between a WJ Grand Cherokee (SFA) 80 series, and my current 4Runner....The 4runner was the only one with IFS, which is why its in my garage.
i have still taken it on plenty of rough jeep trails, just a little trickier and easier to lift a wheel into the air. but my wife enjoys the ride much more. and hitting dirt roads at speed is more enjoyable.
Everyone has their preferences though. and I agree TTB is a sweet set up!