While it's still controversial which one is better, most recent study shows one definite advantage of vegetable protein over meat protein is that plant protein can help lower blood pressure, Those who consume a lot of vegetable protein have lower blood pressure.
Researchers at Imperial College London did a survey on nearly 4700 people from the UK, the US, Japan and China. They found that the more vegetable protein the subjects said they had the lower their blood pressure.
The report published in the journal Archives of Internal Medicine suggested vegetarians tend to be lighter than non-vegetarians and that the amino acids and magnesium found in plant protein may play roles in lowering blood pressure.
Since the study shows plant protein has at least one definite benefit that meat protein lacks, it is highly recommended we add some amounts of vegetable protein in our diet for overall better health. Good sources of vegetable protein include whole grains such as corn, wheat, oats, milo, barley, soy products such as tofu, soy milk, nuts and seeds like peas, beans, peanuts, almonds, pine nuts etc. A well balanced diet including certain amounts of plant protein is definitely better than a diet that gets dietary protein from meat only.