I crossed shopped a tacoma briefly before picking up my 4R. For me, about the only thing the taco has going for it is the manual trans and maybe some better fuel econ. But, the manual isnt available with teh access cab TRD OR, so no thanks.
Other than that, i'd also also have to deal with:
-Tacos significantly smaller brakes all around, and drum rear brakes
-no longer a fully boxed frame
-leaf spring rear suspension, compared to coils on the 4R
-and teh heap of issues that have already cropped up (multiple rear axles replaced, auto trans shifting issues (also, the 6-speed is just essentially our 5-speed with another overdrive. No thanks), high pressure fuel pump replacements/ direct injection noises, etc.
-notable also is the Japan vs texas or Mexico build quality.
-the tacomas have to be optioned with the tow package our 4runners all come with (engine oil cooler, 130a alternator, wiring for both plugs, trailer brake prepped, hitch), the only thing we lack is the aux trans cooler and the one included in the taco tow package is tiny. Much happier with my larger B&M.
-Larger wheels and tires stock (because we can't fit 16" wheels over the huge front brakes
-OEM mudflaps on all trim levels
-No front lower facia to remove
I'm sure there is more. I do like the taco front end design more though.