Part of it is that I have nothing invested in either language and was just curious, but I also think Duolingo itself is a bit flawed; it repeats way too much material and makes you jump through too many hoops. I was busy and it was a hassle.
I think if you're going to study a language, a textbook + Anki is the way to go. If you tell Anki you know something, the algorithm believes you and shows it to you less often so you have more time to focus on what matters. It doesn't make you translate "the black cat" five times in one sitting.
Don't know if that is your case, but if you get the "the cat is black" sentence and translate it wrongly, it assumes you are having difficulty with this expression and repeats until you get it right.
When you come to the point of commiting some words to you memory, it uses them to incrementally build grammatical concepts over there (like adjectives and verbs).
It's a pretty complex system going on behind that simple interface.
If there was an easier way to auto-generate flash cards, I could see Anki being more interesting.
The unfortunate truth is that the mental connections that come from building your own deck is a good portion of the benefit that comes from using Anki.