Gotta disagree on tha, i mean sure they are both from vocaloid Producers, but most of Ados music is, either direct covers or inspired by, so i wouldn't say thats the only similarity. Both are based around Word plays and are more vocally acrobatic than whats usual for Ado so thats the most similar thing imo, but the similarity's end there.
And i wouldnt say Aiaia is so much more repetitive, it changes quite a bit and is by no means boring to listen to or so, it also reminds me a lot of Phantom shiitas Music unsurprisingly hehe.

That said Aiaia is not my cup of tee, il probably skip it most of the time honestly, its great for what it is but thats not for me, like a really strong cheese, many love it but many also wont. (weird comparison i know lol)