After days of contemplating over a long list of great techniques from many different anime, I finally decided that Yamato's Wood Release: Great Forest Technique is the BEST. He can manipulate the chakra in his arm to transform into trees at the cellular level! Not only that, he can stimulate the growth at whatever rate he wants and change their shapes: from branches that could capture an enemy to shape stakes that could pierce them.
A little detail on how I chose which one I considered the best: I looked carefully at the advantages and disadvantages of each possible option. I also chose this one cuz I love wood style jutsu..... (; @VinMcCarthy