Dang. All expensive replies. I know it's a large debate. Or a small one in my searches but if I did this I want just about all I can get as far as comfort goes. Is the trail or trail premium a better route than a PRO model? I of course like the pro. And I know the pro suspension is not a big deal just a nice change from factory. But if I had that I can't see doing much more lift. If I went trail I am sure I'll end up lifting a bit. I really do NOT want to take a new perfect driving rig and make it what I end up with now which is vibrations. Wobbles and whatnot. My OCD is getting a little tired of the past 10 years of jeeps and toyotas. Just looking for a nice DD then I'm not asked. Why the hell do you drive a 18 year old Toyota haha. We all know the passion of the answer but.
The TRD pro is a 4runner with a slight lift (I don't know how much more articulation you're getting out of its suspension, if any), more aggressive tires and a bunch of appearance modifications. If you want one because you like the way it looks, get it.
If you're planning on doing any sort of aftermarket work, just get a trail. The base suspension is surprisingly capable, and compliant, for on and off-road use. If you're going to install a suspension that will truly give you better performance over the stock setup, you'll have to look at Old Man Emu's, Fox, Icon's or something of similar quality. Just getting a spacer lift or cheap coil kit really doesn't do much performance-wise.
KDSS is nice if you plan on leaving the vehicle stock. If you plan on reworking the suspension, you can still have it but it's probably easier to rework the suspension without one.
Get a 4runner, trail or trd, and leave it stock for at least a few months of driving. Use it, abuse it, and then figure out what, if any modifications you need. FWIW, I've taken my stock 4runner all over the place through all kinds of terrain. Unless you're planning on doing some really lengthy and hardcore offroading trips, the stock setup is more than capable of getting you where you need to go. My 2 cents....