I agree about the poor plot in Castlevania. And I prefer DoS over AoS because it's basically AoS done right in terms of gameplay, even if the story "shits all over AoS". The story in AoS wasn't even that great to begin with so it all boils down to this: Which game is more fun to play? DoS, IMO. They're both fab, but DoS wins. Fatality.
AoS' gameplay had nothing wrong with it. In fact, I preferred most of it's souls. They just seemed better. <3 killer mantle
I DID find the succubus sol in DoS amusing, how it made soma take a bite out of an enemy in front of him, but it was hardly practical.
Also, the ability to only be able to get certain weapons by giving up unique irreplaceable boss souls, seems more like a downgrade to me.
DoS was fun, but felt more empty. it didnt have the same charm Aria had. At all. The music was also not as great, even though it was good in it's own right. And lets not forget that it nerfed Julius. I mean, im not xpecting him to be on the same broken level as Aria, but really, He just seemed so watered down. No omni Vanitas, no super jump, and his Holy Cross just didnt look as cool. Alucard got hit with he bat too.
Aria was the superior Sorrow game. In Atmosphere, writing/story, music, and I daresay gameplay. All Dawn really added was the weapon synth, and it involved trading off boss souls or grinding for one specific soul, which got boring really fast, since it could take a long ass time. It also switched around and changed certain soul abilities. Some for the worse. The seal system was also highly unnecessary, and Menace was a shitty final boss. He was only hard because of those godammned things he spews which take huge chunks of health out of you.
Aria also had a few continuity nods here and there, (Olrox's clothes, DRACULA'S Clothes, the Alucard save coffin in the save room background)
Even Yahtzee liked Aria, citing it as one of the "stallions" of the series, along with Symphony.