You need tools to help you:

 

• Structure - What are the important factors?
• Qualify - How to measure impacts? What are your priorities?
• Visualize - What makes it difficult to choose?
• Analyze - Is it safe? Is it really good?
• Decide - Rank decisions from the best to the worst one.

 

You need a good multicriteria decision aid approach.

 

You need PROMETHEE & GAIA.