What is the difference between SIC and Figuart? Other than name.
Aside from the scale differences, SIC's 'main' difference (or selling point) are the re-imagination of the Riders which are usually based on the manga. They are more darker theme and some even are more biological take Kamen Rider Black/RX for example, it looks exactly like a creature, but yet very cool.
Here is an example of Kamen Rider ZX (original) compared to the SIC version:
Aside from the re-imagination part and scale, the prices for SIC are a lot higher compared to SHF. While SHF has better mobility compared to SIC figures and are cheaper.
SIC's are more high-end and are mainly for posing and collecting, whilst SHF is more of playing. At least to me it is.