I have to retract my overly confident assertion: "best" for bars and saddles can only mean "best for me." But here is what I like about the Maes Parallel, after using scores of other road and "dirt" drop bars.
The long flat ramps. I like my bars set up with ramps and ends of hooks parallel to the ground, and the MP seems perfectly designed for this, allowing you to mount your levers high enough without eliminating the flat ramp ahead of the hoods.
Positions: Instead of 4 positions: hooks, hoods, ramps behind hoods, flats, I get 5: hooks, hoods, ramps behind hoods, ramps a bit further back, flats.
The flat hooks. My left palm hurts when I rest it for more than 10 minutes on a slanted hook. The other day I was in the hooks of the MP bar for a good 5 miles non-stop, total 7 miles with a bit of a break; again, very sensitive left palm. True, I did shift the left palm around every half mile or mile, but I was in the drop position as described. Can't do that with drop bar slanted downward.
The moderate drop. I like an aero hoods position, but enough difference when moving from hoods to hooks so that there is material advantage against a headwind; but I dislike deep drops which at almost 68 I find too low -- reason I swapped out the 140 mm drop Nitto 165 and Giro d'Italia bars for the MPs (both have 90 mm ramps and 140 mm drop, IIRC). The MPs are wonderful for this: again, long reach, modest drop.
Finally, the quality: the best of Nitto standards among all the levels of high Nitto quality standards.
Oh, and even more finally: they have a prettier polish than say the Noodle or 165 or GdI.