i'd use any tne from a reputable source. i fucking love me some tne.
your question as to which source is the best will require personal research. i've had issues with MCT EO-free tne staying in solution. guaiacol or EO seem to be in everyone's blend (to keep it from crashing), so do you want a funny taste/smell from the guaiacol, potential negative reaction to EO, or unstable gear? you need to find what does or doesn't work for you.
btw, crashed gear isn't hard to fix and guaiacol smells/tastes like broken vagina/PRs. also, i'm not allergic to EO and you might not be either.
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