It is better to take part in different projects in order to get various altcoins.
Some good projects may die. Also they can be unprofitable. So it is hard to choose one the best. It is better to do a number of them. Also there are postponed token distribution. For example, I had been waiting for Tezos tokens for year and some months. So in order to get some money and do it quickly, you have to do a lot of work.