I had seen the thread and it was helpful. Hangloose’s reply as someone who has experienced both locations is especially valuable.
St Kitts is a much, much smaller and quieter resort, with only 88 units.
From a purely financial perspective, I am fairly sure that Aruba would be the better choice.
From an experience and enjoyment perspective, they are like chalk and cheese.
It is highly likely that many who love St Kitts will dislike Aruba and vice versa.