The chant that "X is best, period" is a religious notion, not a practical one. You're welcome to worship whatever you please, but for those of us who are here to have a real-world impact, "best" is defined in terms of utility for a particular situation.

Even one of the great RDBMS pioneers, Stonebraker, agrees that RDBMSes are an artifact of a particular era in technology and commerce and should be thrown out and done over:

http://nms.csail.mit.edu/~stavros/pubs/hstore.pdf