One thing that's surprised me in the Denver area at least is that 4x4 Tacomas seem to be quite a bit more expensive than 4th gen 4runners. I don't know if it's just supply and demand or what, but it strikes me as a bit odd because 4runners are pretty "up-contented" compared to trucks (IOW, 4runners come standard with a lot of things that are options on trucks, like power windows, doors, keyless entry, automatic climate control, etc.)
Assuming you're buying used, it's pretty easy to find a 4runner that has spent its time as a "soccer mom mobile" and never been off road, whereas a truck will often have been used as a truck. Of course, with this particular vehicle that's something of a mixed blessing because the weak link is th electronic transfer case control. On some of the older 4th gen 4runners, if the previous owner never used low range or 4wd, sometimes the actuator will be 'frozen' and not want to move. I don't know if the Tacomas have the same issue, although I assume they do since it's the same kind of arrangement with the electronic t-case switch. Honestly, that's the only thing I don't like about this generation of Toyotas - seems like an unneccessary built in failure point.
Having said that, failure rates are still pretty low, and I've never had a lick of trouble with mine. Just make sure you test it in all possible modes before you buy.