I've owned a Whisperlite International and an XGK. Used the XGK with diesel once while traveling in South Africa. Won't ever make that mistake again! More soot than anything I've seen before or since. Stove, pots, hands: everything got absolutely filthy! Tried kerosene in Zimbabwe and it was only slightly better; nowhere close to the quality of the kerosene I've used in the U.S.
I've never been a big fan of the Whisperlite stoves. If I wanted an "international" stove, the only ones I'd consider are the XGK-EX and the Dragonfly. The XGK is, allegedly, lighter and slightly more fuel efficient but if the dual-valve design on the Dragonfly works it would be my choice. Don't know about the XGK-EX, but controlling the flame on my old XGK is a bit difficult. It really only had two reliable settings: full-blast and off. The XGK is also really loud. At full-blast, it seemingly makes as much noise as a jet engine...