Define "according to your personal preference" and in what specific aspect.
You can never trust predictions even though the one who published the prediction is a so called "expert". The cryptocurrency market is too unpredictable in many ways and believing in an expert is not a wise move. There might be some close results but relying on their analysis will not suffice.
Yes choosing a good altcoin is always tough for job but it is simple when you are in this field since long period before investing take long time it will help you to choose the best currency otherwise you may able to last your investment soon .