It's a bit of a loaded question, but all the generic E negation cards in standard right now run a 4 check with a 4 difficulty, and the second enhance on no memories costs 2 momentum which on void, not easy to come into. The action side of Rising tackle is a 4 difficult 2 check with a less than great attack side. the R negation how ever seems to be more so 5 checks and lower on average controls.
I recognize that KFT needs 2 commitable foudnations, which is mitigatable with chasing the power and determined, and Inhuman needs a discardable card (also can be worked around). It just feels like theres more of a premium on E negation than other Negation. Is this because we are all still trying to live down yoga mastery or is it truly that we think R negation should be much cheaper?