I'd recommend having a permanent rinser installed - I have the Quickie Flush and am very happy with it. It allows you to jet wash the tank sides and sensor probes and also fill the tank with water to allow you to flush all the nasties out.
I have only used the Quickie Flush so I don't have first hand experience using any of the 3 options you listed.
In my opinion, the Wand should do the best job, but as others have pointed out it is a PITA to get into and out of the rv. Also, you need to operate it with the toilet valve open and there is a lot of spray and mist generated by the jets hitting the tank walls, so probably not the most hygienic thing to do inside your rv.
The Flush King is also good as it allows you to fill the tank, but doesn't jet wash the sides of the tank and sensor probes like the wand and internal rinsers do.
The Hydro Flush is probably only good for cleaning the section of pipe it attaches to.
Just my 2c.
Enrico and Donna + 2 kids
RAM 2500 + Jayco Jay Flight 25BHS
Black tank Quick-e Flush, MaxxAir Vent cover, TV bracket and LCD TV, added Slideout awning, bunk ladder, added socket and reading light to top bunk, added bathroom fan switch near light switch, insulated all externally accessible storage, sealed pass through storage from interior of trailer, LED lights throughout, added LED lights to storage compartments