Challenges in a leadership roal....

It's been 3yrs leading teams for different projects and still have a doubt. Whether should I work for client or work for building a real good team? I know everyone will say both, but in real scenario it does not happen. I have realized building a real good team can deliver much more to the client, so I always try to build the team first, bringing them into a level where we should discuss more about process improvement rather than project technical stuff. Everyone can learn technology but very rare people understand the business for which we are building the technology. The day team understands the real business requirement and it's impact, then they build the real product, which make real difference. A company should focus more on this to build real team and real lead, a lead who can be the father of his team and the real mentor. Wish I could be that lead..!!