This is my first post here so I'll make it a simple one. Personally working something like a third level Kiba is very hard on the knees. If you work it often enough you'll probably need knee surgery before you're in your 40's. When I started training that is ALL we ever used. We were taught Shiko, but it was never used in kata or in anything else really. As I got older I began to gain more and more knowledge of body mechanics, and the fact that the Kiba was more damaging than I thought. Now, I still use Kiba in competition and sometimes when just working in the dojo, but more often than not I prefer to work Shiko. In Shiko I can sink a little lower without the added stress on my knees. Really there is little difference in form or function, it's more a personal preference on which you work. In Shiko, though, I find that most people can work it lower more comfortably and thus lowering their center of gravity if you are sparring with someone who is keen in judo. Some would argue that Kiba is easier for stance changes into Zenks, but I've never found it awkward to go from Shiko to Zenks or vice versa. I do find a Shiko more suitable to shift into a Kokes (lay out stance). I guess I should add this somewhere. Hello my name is Chris. I'm getting ready to receive my Nidan in Shuri/Shorei-ryu, and I hail from North Carolina.