I came across the Detonating Arrow (DA) Build with Explosive Trap (ET) using Jelkhor’s knife to a discussion whether Lightning Damage or Lightnig Melee Damage is a better choice for affixes on the knife and the relict. I would assume that LD > LMD because ET also benefits from.
there are rumors in the theorycrafting community that Melee Lightning Damage is better in early game and with better gear % lightning Damage gets better. But I didn’t see any calculations for this thesis yet.