Too Long; Didn't Read
Pelican has a much smaller community than Hugo. Hugo's open source project on GitHub is currently showing 54.4k stars. Hugo boasts itself as "The world’s fastest framework for building websites", and I can definitely see why. Hugo also has excellent Documentation you can easily find what you want should you implement a new feature. Hugo's free or paid themes are very vibrant and active, result in many options to choose from. Go is known for its great concurrency prowess. It's a language worth putting some time into.