Concept for a Magic Melee DPS

[Archwizard]

So of those which would you favor?
-Scimitar
-Partisian
-Naginata
-Blade whip

Unfortunately, DRG weapon designs rather go beyond "lances" and "spears", and includes several halberd and partisan designs (including but not limited to several generic ARR spears or the White Oak and Slipstream Partisans). Several of the "harpoons" verge on naginatas as well, and the Doman spears like Iwa-toshi or Rakshasa/Yama Lance remove all ambiguity; while I'm sure you would say that the difference is in the use (thrusting, stabbing and poking vs. slashing), DRG attack animations and the removal of physical damage vulnerabilities make the distinction somewhat moot.
In short, DRG is sort of all-encompassing with regards to pole weapons. The Flame Captain's Spear even appears to be some kind of bladed mace.

The Blade Whip or some other augmented sword isn't necessarily out of the question... although we did just have the Gunbreaker take liberties with augmented sword designs, and the whip is historically more the purview of pet-oriented jobs like Summoner and Beastmaster. I won't say no to it, but it would need to have some pretty solid justification beyond just "it was cool and all we could think of".

Scimitar, I've already suggested and explained my reasoning, so sign me up for those curvy swords. PLD has several curvaceous blade designs BUT they're all designed as one-handers, while we can take more liberties with a longer single blade as a hand-and-half weapon -- swap between enchanted two-handed swings and quick one-handed slashes as you prep a spell with the other hand.
Plus it wouldn't surprise me in the slightest if the devs just decided to call it a runeblade -- "it's distinct 'cuz it's MAGIC", whatever you say Yoshi.