Irina, I'm sorry, but there's not enough Harm Reduction involved in this to truly warrant keeping it open. Please be more specific or have a clearly defined objective in mind when creating threads. Both are Opioid agonists, although Buprenorphine is also a partial antagonist, which tends to make it subjectively less enjoyable. This also makes it less likely to cause fatal overdose through respiratory depression. As far as discussing the subjective differences between how they make you feel, that's not something we do. We only discuss safety and Harm Reduction.
If you have a more specific question that you need help with, please don't hesitate to create a new thread, but a thread that is just "compare and contrast these two drugs" just doesn't have enough juice to keep it alive.