Most challenging and wanted DPS class?

[Azerhan]

Most desired dps jobs: BRD, DRG, NIN, MCH.
I can't speak for DRG and NIN since I don't play them.

MCH and BRD are almost equal in terms of dps if played very well. However, a poorly played MCH does more dps than a poorly played BRD.

Example to compare their dps:
O4S normal kill:
- MCH dps: 4,376
- BRD dps: 4,224

O4S speed kill:
- MCH dps: 5,097
- BRD dps: 4,897

Whoever has RNG on their side will do better.
You can see from the numbers that their dps is fairly close, with 100-200 difference due to RNG.

Yeah, proc are important. In MCH for ex, when I'm trying the O4S dummy, I've done it one time 30s remaining and the other times that was around 20s, just because I've a good RNG.

My answer about the OP's question is: most challenging and wanted is different a lot. NIN is not particulary hard except for timing TA, but is surely the most wanted job because of that. MCH is way the hardest dps imo, in all point, but because he had Hypercharge, it is at the same levelo of the NIN for "wanted job".