>>9492364plastic gen is still better, because the core of the plastic gen determined the spin direction, which meant the attack ring and base could spin either direction, basically doubling the possible combination of useful builds, compared to burst, where only a very select few can spin reverse as a gimmick, rather than as a strategy. Hell, you could use the same build with the only difference being spin direction if you wanted to.
Say you had a really effective defense type, but your opponent was using a revers spin attack type to steal spin? Swap the core, and suddenly they no longer have that advantage.