The main difference lies in the fact that you can rely on the opinion of an expert. He knows what the customer needs, and is ready to share his both positive and negative experience. He sees the picture as a whole and has all necessary knowledge and skills.
The philosophy and strategy of TRAMIS are based on the priority of long-term prospects over short-term benefits. It is much more important for TRAMIS experts what to aim at rather than how fast they can do it!