It is a relative answer. The best coin at any instance is relative to your position. If you are a big investor who can take a huge risk, then any coin would be a good coin for you. If you want to invest a small amount, then you need to know what sort of return you will be expecting after a particular duration. In that case, you have make your decision more carefully. At the moment, most of the coins are being traded at a lower price compared to what we have seen about two weeks back. Market have become some what bearish and it's hard to say what will happen on next hour or so. Hence, need to study the market behavior more than ever before when making the final investment decision.