Mattel brought over main assortments of these: 3 inch, 5/6 inch and 24 inch toys. The first two sets were heavy die-cast robots brought over from the Popy line in Japan, while the 24 inch toys were all plastic and rather cheaply made. While overlooked for many years, the popularity of these toys surged in the late 90's and some of the less common variations can command very high prices. Most popular seem to be the 5 and 6 inch series, the Two-In-One (transforming) toys in particular.
Later releases of Poseidon seem to be the most common of the Shogun Warriors toys. Not having "robot punch" fists helped becasue that's one less thing to loose!
The early release featured swing-back rocket launchers and drop down treads on the legs. Both of those are fixed in position on later releases. There are also a few cosmetic changes.
Shown here at the early and later releases of Dragun. The main difference is that the axe-hand on the early version will launch off in a "robot punch" and that it is fixed in place on the later versions. There are also some cosmetic differences.
From my experience, Raider seems to be the least common of the 5" toys. But, it's not particularly impressive, and I've never seen people specificly looking for one, so I don't think there's any added value in that fact. I believe that Raider also came with a fists that can used in place of the drill and launcher. Mine is missing those pieces.
Raydeen is the archer robot that changes into a bird. This toy has probably the best of the transformations in this series.
Shown are the both the American and Japanese releases of the Dangard Ace toy. The differences are only cosmetic. Dangard Ace isn't really much of a Two-in-One as it doesn't transform. In the cartoon, the robot rearranges into a flight mode, with the head detaching and becoming a small fighter jet (see my Action Vehicles page). While the head does shoot off like a missile, this version does not have the transformation.
Easily the most popular of the Two-in-One series is Gaiking. On this toy, the legs detach, the arms and head fold in and this toy becomes the skull head to the space dragon Daiku-Maryu.
"17", Grandizer and Gaiking