The quicker you get to WS = more damage over time. The entire logic of Samurai (job) is what all other DDs should work towards: getting to 100% TP the quickest way possible.
If my Ninja did Samurai WS damage on anything harder than merit mobs, I'd focus on the 9 round build. Sadly, it does not, and with double attack I usually reach a WS in fewer rounds anyway.
Just to be clear, to go to a 9 round build you're talking about giving up a pretty nice chunk of acc, attack, haste, and DW. I don't know about other ninjas, but most of my damage comes from actual DoT, not Spike. In theory the 9 round build sounds pretty cool, but I just can't see it panning out in practice. Feel free to parse me wrong, if it's better I'll switch my stuff
Here's my melee gear:
Senj/Perdu, Fire Bomblet
Turban (kabuto/Ohat WS), Hope, Suppa (Fenrir/Merman/Diabolos swaps for WS), Brutal
Koga/Ninja+1/Osode/Haub, Dusk Gloves/Koga Tekko/O Kote, Rajas/Iota/Ulth
Cerberus mantle, Swiftbelt/Warwolf/Lifebelt, Byakkos, Fuma/Rutters/Koga+1(night WS)
I'm 2/3 on about 5 salvage sets across my jobs, when luck turns my way those feet will be pretty nice -_-; Stupid bee.
You should be able to figure out what I TP in, I tried to note some of the WS pieces. I change gear- a lot. I'm sure there is stuff I'm forgetting, but this is basically it. If you want I can post pictures later in the gear thread, but I really didn't think this was the place. Basically, I may not be all white boxes, but I like to think it's not gimp by any stretch. That said, I'd wear my current gear over a full usu set for about anything other than looking good.
And because it may be asked, my combat merits are capped, etc etc.