The original f/x planet killer is way better than the TOS-R version. The original looks old and rough and genuinely alien.
QFT. Much of the Remastered work looked either cheap or rushed. Why they didn't use the same effects people who were doing the work on ENT at the time has always been beyond me. Take the best shot of the Enterprise
from the remastered episodes and compare it to the Defiant
in "In A Mirror, Darkly"...