It’s quite difficult to answer exactly this question.
Unambiguously, we can only say, that two planets are better suited for a beginner, it’s Calypso and Arkadia. On these planets, the newcomer receives the best training.
But any further active activity on these planets is more complicated, that on these two planets any participant has much more competitors. What reduces any potential profit.
Besides, developers of all planets compete with each other, introducing in each update various interesting objects or missions, what are trying to win the attention of participants in the Entropia Uiverse. therefore, when conducting vigorous activity of any kind, it can be carried on any planet, except perhaps Next Island, since it has been abandoned for several years and its population is only a few people.