The 70 TX9s are easier and more plentiful to find.
I know this much- They made fewer 71s than 70, and the drivetrain choices were not as bountiful.
71 was a popular year for the hi-impact colors. The take on the hi-impact far superceded the take on the traditional primary colors- Black, White, Red, Silver, Gunmetal...
For some reason, these oddballs just have an unmistakable presence...
Of the least popular colors, black and white are the only ones you could order in a triple combo.
I know that you could order triple green, triple blue, double red, double burnt orange....
Dan