Doesn't really matter. They aren't going to make a big enough difference to warrant a lot of their price tags ($10-12+ for 4g). You're better off just not spending it or putting the money towards something else, like a beefier heatsink that will actually make more of a temperature and or noise difference (e.g. going from one of the $35-40 heatsinks like the Hyper 212, Pure Rock, or Freezer 34 Esports Duo to a $45 Mugen 5, $50 True Spirit 140, or $55 Macho, Fuma 2, or Ninja 5).
If you absolutely have to buy one, MX-4 is the least expensive of the "better" performing pastes. If you really need the best of the best, get Kryonaut or move onto liquid metals.
Last edited by HybridCore; 11-19-2019 at 10:45 PM.