Sim's 4 Island Living/Sim's 3 Island Paradise Trailers Comparison

I came across this thread just as I am in the middle of re-organising Island paradise to my liking as it is one of my favorite 3 worlds where my sims can sail around the whole map, dive into actual dive lots and get involved in a host of other tropical island life activities such as boating/water skiing and even buy/run their own resort and I simply love the playability of this world however when I saw the new 4 island living I am prepared to give it a go as it looks so damn cute (especially the dolphin-) but I am not sure how much long term playability I will get compared to S3 island paradise :)