I have all 3, and my vote goes to the Izula II.
I find that the pointier blade, and the extra leverage from the longer handle makes the Izula II feel more powerful and capable than the small Beckers.
Even though the blades of the Beckers are longer, that only makes the small handle (essentially the original Izula handle; noticeably shorter than that of the Izula II) seem not ideal overall. It just feels like the power transfer, leverage, and control is not as good on the Beckers; the Izula II being superior in this regard.
I also feel that pointier blade of the Izula II is equally as adept at thrusting/stabbing AND slicing.
The wider, blunter blades of the Beckers, along with the shorter handles (less leverage) makes the them seem more suited to slicing to me.
Having said that, the Beckers are still very nice blades. The D2 steel on the BK24 feels especially nice and is more corrosion resistant than the 1095 steel of the Izulas and BK14.
On the Beckers, you really do need 3rd party scales to get the most out of them.
If I were to get one, I'd go for the Izula II. If I could have two, I'd go for the Izula II along with the BK24 for the more corrosion resistant D2 steel.