The 3217 is cheaper and more future proof. I’d like to think that this latest generation chip would have better internal clocks and temperature sensors but I can’y find anything in the spec sheets to prove it.
No one spends more time programming and testing than you do. It doesn’t seem like it took a long time to outgrow the 13,25,45 and 85. This time you get to choose the new chip. Twice as much memory as a 1634 and a three pin programming key can’t be a bad combo.