Red meat contains more fat and creatine.
Fat is not bad, creatine is good. Red meat also contains certain cholesterols that boost your testeron.
So don't exclude meat from diet. Just don't make the stupid mistake of eating pounds of them like in the nineties, 200 or 300 gram a day is enough.
Contains about 50 grams off proteine.
If your main goal is to gain weight,
make sure your diet contains plenty of healthy fats. If you don't, you have to eat a lot of carbohydrates, and that's stupid.
Fat contains twice as much energy as a carbohydrate,
fat doesn't need extra water (fluid) to be digested. Every gram of carbohydrate needs an additional 3 grams of water to be digested.