The Apogee is a hard working frame lock design with great features for general utility. The Krait is also a practical utility piece but with a sleek race car good looks and style.
As far as ergonomics and utility I prefer the Apogee however the Krait has a look all its own.
No comment on the Sebenza since I don't have one. I'm sure this is also a great utility piece but not on the design/style level of Darrel Ralph. I also prefer Darrel's recure blade designs over the Sebenza.