Honesty I MUCH prefer my LJ78. The Surf is a totally different creature. I always found the 4runner/Surf to be more like a car body sitting on a frame. The landcruiser feels much more like a truck all around. Even though I'm only 5'10" tall the Surf feels tight. I have to sort of slide into it rather than climb into it. Has taken some getting used to. Way less head room inside. I dislike the rear electric window tail gate system compared to the 70 series ambulance doors. I don't like the clearance underneath with the different t-case and mid mount fuel tank. I don't think the interior is any better. My LJ78 has all the same options. Honestly, I even prefer the A343F of the LJ78 over the R151F for nearly everything. The only things I like about the Surf, are the mechanical injection system of the 2LT-II. I can't wait to get my LJ78 back on the road at this point. Landcruisers (even the light duty) are just so different than the 4Runner/Surf. Everything is bigger and tougher built in the Landcruiser.
Edit: One more thing I meant to include. The visibility in the 70 series is much better. Also, I feel more connected to the road/terrain in the 70 series. The Surf isolates the experience a bit. 4x4ing in the 70 series would always be preferable.