The specific details of each of these handy anchor systems are listed for your perusal, but in general all three types are anchors designed to keep your King Canopy shelter firmly in place in different situations. The Foot and Foot2 varieties are more geared toward applications for mounting the canopy on a wood surface like a dock or a deck, each a different size depending on your individual needs.
The HICA-S model is intended for concrete applications. It requires some concrete drilling in order to set up, so make sure you have that capability before picking this particular model. Once you've done that, though, you'll find that there isn't a more secure concrete anchor out there.
The main point of each anchor model is to really keep the shelter where it's supposed to be. Wood and concrete can be notoriously difficult places to place a canopy, so you'll likely need some kind of anchor if you plan to use your shelter on these surfaces or some others like them. If you do have those needs and want your shelter to remain exactly where you planned it to be, then the Concrete Anchor for King Canopy Shelters is likely your best bet.