unless I'm misreading, I don't think you'll make any enemies telling us our cars values are holding up well.
new vs used is always a tricky decision to make, really depends on your income/budget and if/when you wish to sell later on.
Why do the hold their values well compared to other sports cars?
lots of factors.
One is the fact that they're produced in such limited numbers, and even fewer in recent years it seems.
arguably making it an "exotic" (or quasi-exotic) sports car.
and anything exotic will hold it's value better over the years.