I have both. Do you need increased towing capacity? Do you have plans to make use of the bed? The extended length can be cumbersome in small parking lots.. The power is nice compared to the 4Runner. You cry more at fillup, but you can get a 38gal fuel tank. More legroom in the back if you get a Crewmax. Appears you can get more suspension travel when lifting. However the increased wheelbase may negate that..

The 4Runner is great to just jump in and go anywhere. Slightly more comfortable. Better MPG, if that matters. More offroad capable on small trails. Depending on year, better stereo. The Jbl is terrible in the Tundra. I don't regret either one. They both have purpose. You need to decide what fits you better.