Ne: Interpreting situations and relationships; picking up meanings and interconnections; being drawn to change "what is " for "what could possibly be"; noticing what is not said and threads of meaning emerging across multiple contexts
Ni: Foreseeing implications and likely effects without external data; realizing "what will be"; conceptualizing new ways of seeing things; envisioning transformations; getting an image of profound meaning or far-reaching symbols
N types are good at brainstorming per se, yet, Ne users seem to have way more potential. Ni is pure insight, more of a 'prevision'. If you want a couple of good and effective ideas, ask a NTJ. If you just want lots of ideas, ask a NTP.