I chose Rowlet because I personally think he's cute and his final evolution really cool being Grass/Ghost. But who do you think is the best? Who did you choose?
I started with Litten. Whilst it is cute as hell, I now regret my decision. Popplio just sucks imo. Rowlet all the way.
Why do you regret it? I picked Rowlet because it has a nice bowtie and Decidueye is cool. I had some trouble in the trainer school vs Grimer and a constantly paralyzing Magnemite tho.
It's slow, I'm enjoying having it less and less to the point where I want to replace it, its level up moveset isn't ideal for me... I've almost exclusively been using Grubbin -> Charjabug for all of the early game.
I went with Rowlet, and I enjoyed using it and its evolutions throughout the game. The main issue I had with Decidueye was that it was a bit too slow at times, but it is still the fastest of the three. It does learn Sucker Punch which can help the Speed issues a little bit though.