Best is Shin Etsu or IC Diamond or MX2/3 or Indigo extreme (insanely expensive and hard to apply).
a bit off topic, I recently aquired 3 old tubes of shin etsu, with the red cap on the end.
Do you happen to know:
which model of shin etsu is the one with the red lid?
and if it is supposed to be thick or if my stuff may have dried out?
there seem to be various models and I think I have the not as good shin etsu
regardless, it still tested pretty good, performing about 2*C lower than the new bottle of mx-2 I have and I'll be using it for anything but my own "good" systems (ie old systems, other's system)