I did the cyling tour today with Bali Bintang and did the similar tour with Baik Bike 2 years ago and want give some feedback. I'd imagine service, guides etc change with time so the comparison may not be accurate as I did the Baik Bike ride 2 years ago but here's my info:
I found Baik Bike better in every aspect. The first stop plantation/coffee and tea sampling were similar but Bike Baik was more scenic area. The Bike Baik ride was better paced and the guide continually stopped, gathered everyone and gave plenty of explanation throughout the ride. With Bali Bintang they only stopping on a few occasions. The meal at the end of the Baik Bike trip was a feast and amongst the best Indonesian food I've had.