I prefer to read as I can pretty much have full control over the pacing or time commitment to whatever I am enjoying. I can't really take 5-10 minutes to watch part of an episode of anime, but I can read a chapter or 2 from my phone when I feel like it. I will admit though that some scenes I really enjoy from a manga I either wish I could see animated or if they have been, they absolutely have a stronger effect on me seeing them in animation.