I've seen and really liked both of them! Return to sea is better than Ariel's beginning in my opinion but I still liked them both :)

Return to the sea is pointless - it's like retelling the same story again, in a much lower quality. And Ariel's Beginning is just awful *shudder*

It's okay, the animation is really nice. :)
I really really hate Return to the Sea, can't stand Melody.

I really like them. Melody is annoying but I like the film and the songs, I like the fact that it's her daughter wanting to be a mermaid.
Ariels beginning is good cause we get to see Ariel as a child and her mother and sisters more but I dont like the no music thing, its a bit silly

This one is ok, the Ariel's beginning is AWFUL.

it's not that i hate the sequel, but the only decent character in that movie is melody..and the story is not that great..but the third one is awesome, i love ariel's sisters

It's ok.

They're all right imo.

ariel's beginning was just ok for me. i didn't like it as much as i did this one

Terrible. TLMII destroyed Ariel's character, TLMAB destroyed continuity and Flounder's character and didn't tell the story the fans wanted (Ursula's background and an actually interesting story about Ariel and her mother). The only redeeming quality was SOME of the music and the beautiful animation in Ariel's Beginning. If you want a better story (albeit with lesser quality animation) about Ariel's beginning, watch the TV series.

I love Return To The Sea to pieces, one of the best disney sequels. I absolutely hate Ariel's Beginning, it's completely random and stupid, the worst disney sequel.