What are the best performing mutual funds in Bulgaria, and how do leading funds such as Advance Emerging Europe Opportunities, Advance Invest, DSK Dynamic, and other equity and balanced funds compare in terms of returns, risk levels, asset allocation, and consistency of performance? Additionally, how do factors such as fund management expertise, regional market exposure, economic trends, and diversification strategies influence the overall performance and suitability of these mutual funds for different types of investors in Bulgaria?