Not enough info about you or the specific bike to make a call. They're all quite decent bikes.

There's a big difference in the Nishiki Internationals over the years, it went from touring to sport to racy. IIRC there's a fair amount of change in the Tempo too.

With these older bikes, I think a huge part of your selection criteria should be about tire compatibility and how the frame rides. How wide a tire can fit in the frame and how 'racy' is the frame.

28-32mm wide tires are fast but typically deliver a more comfortable ride. Some frames are limited to 25mm, some 23mm; hard and fast.

The tour-sport types handle comfortably; riding without hands is easy. Some of the race bikes are twitchy; they require focus and it takes practice before using 2 hands to unzip.