I think that the Boston Celtics are the best team. The Celtics have been one of the dominant teams.The Celtics won a record eight consecutive NBA titles from the 1958-1959 season through the 1965-1966 season under coach Red Auerbach. Stars of those teams included center Bill Russell; guards Bob Cousy, K. C. Jones, and Sam Jones; and forwards Tom Heinsohn, Bailey Howell, and John Havlicek. Boston had another great period from the 1973-1974 season to the 1986-1987 season. Atlantic Division of the Eastern Conference. The Celtics were formed in 1946. Celtics won five NBA championships in the 70 and 80. Celtics are a professional basketball team.