First of all I congratulate you for the mature decision to consult the crypto community here on Bitcointalk before making your decision. I haven't used, nor I've ever heard about the SunCoin platform & I think most of the community members here are in my situation. What does that mean? - Well.. they don't have any marketing in place - that COULD BE due to the fact that they are not reliable. However if you're just starting out in the cryptocurrency space you should use a more reputable exchange like Bitstamp, Binance, Kraken, Gemini, etc.