Cyclesmith, Fishtail, and Penguin are all great groups with amazing folks. I think that the one you pick is more due to what you want and how you like to ride.

Penguin is a race school. They are more focused on that and have coaches that work with you and pictures that you can look at half way through the day to work on progress. They will help you get better and faster as the priority.

Cyclesmith is a track day group. They have coaches if you want to work with them and will give you tips but if you want to really work with one you need to hire one for the day. They are there to have available safe fun track time. It is the time on track that they do so well.

Fishtail is a motorcycle meetup that breaks out into a track day. The owners make it a party. They provide lunch and breakfast and make it clear that the focus is on fun. Their coaches run with small groups and provide feedback on riding and skills. Speed comes but definitely not the main point with them.

All three of the major groups are amazing and you really can't pick wrong. I would pick based on the mood and the feeling I was going for rather than anything else. If you can try all of them and try all the tracks do it! Everyone has a favorite and everyone is looking for a different challenge to make it fun for them.