Baby Princess 3D Paradise 0 [Love]

•both anime are different in the type of format they are, where one is an ongoing series, where the other is just a quick OVA •both roughly start off the same, where the main protagonist is thrown into this new family where they have so many new siblings and they are all of the opposite sex to them. •both anime are pretty easily readable as in what the future expects as the audience watches the anime, where all the siblings start to 'feel' something for the main protagonist, either it be mutual respect, just plain friendly, or incestual love develops which is common from these types of anime. •both contain all the different types of personalities there are on each of the siblings, where it be, overconfident, shy, tsundere, bashful, handsome, well endowed, bustful, etc, they show all the types where the audience can imagine the ones they fall for as the story progresses •they are similar where the protagonist joins a new family full of opposite sex siblings and they start to grow feelings for them, you probably might like one, if you like the other, but the audiences for each of the anime are mainly different. read more 

Both these series have similar harem and incest themes involved between one main character and a lot of siblings. The difference is that one is a reverse harem while the other is the usual harem. 

Both have the same 1 to many harem competitions for the MC, except one is a reverse harem while the other is the usual guy to girls kind of harem