Knee sleeves are SBD by far. Elbow sleeves are also SBD, and if you want even more support i would go with the Inzer XT. They offer adjustable straps. I know a lot od people like SBD elbow sleeves but i dont use them. Theyre more for just keeping elbows warm. If you actually want support and a little bit od rebound go with the Inzers.
I know mark bells Strong sleeves were very comparable, however i recently heard that they compromised the product by making them thinner. They used to be the same thickness as sbd making then essentially identical. I was told the newer strong sleeves were made thinner, probably so slingshot could make a bucj.