It's hard to single out the best authors of puck and rachel lemon fanfiction. But some signs of a good author in this area are those who can write believable dialogue for the characters. Since Puck and Rachel have such distinct voices, it's important. Also, authors who can add new and exciting twists to the relationship between them are worth looking for. You can start by asking in fan forums or groups dedicated to this fanfiction. Fellow fans might be able to recommend some great authors they've come across.
There isn't really a definitive list of the best authors for this fanfiction. However, you can look for authors who have been writing in the puck and rachel lemon fandom for a long time. These authors usually have a better understanding of the characters and their dynamics. Also, those who are actively engaged with the readers, answering comments and taking suggestions, often produce great works. You might have to explore different platforms and read a few samples to find the authors whose writing style you like.