In order to tell you which strategy is better for your company, we should take a look at your current SAP system, your company processes, and most of all – your data. Previously, we were able to give you some recommendations based on our own experience. SAP systems, like the one that you use in your company, have, however, developed tremendously through the years and keep on developing further more. That is why, they need a complete overhaul. The processes were shown in a very complex way and the data was either redundant or incorrect. If this is your case, we would recommend you the Greenfield strategy. Newer systems, however, or systems with very specific processes can implement the Brownfield strategy.
On our website we have explained the pros and cons of both these strategies. More information here.