Whey protein is generally better for muscle growth because it is a complete protein and is rich in leucine while plant protein can also be effective when you choose a complete blend and consume enough protein
The best choice depends on your dietary preferences digestion and fitness goals.
Whey protein is usually a convenient choice for muscle growth because it contains all essential amino acids and is naturally rich in leucine.
Plant protein can also support muscle growth when you consume enough total protein and choose a good quality source such as pea soy or a blended plant protein.
If you are comfortable with dairy whey protein may be an easy option because it is highly digestible and provides a strong amino acid profile.
If you follow a vegan or plant based diet plant protein is a practical choice and can work well as part of a balanced high protein diet.
Whey protein generally has a higher amount of leucine which plays an important role in stimulating muscle protein synthesis.
A plant protein blend combining sources such as pea and rice can provide a more balanced amino acid profile.
Plant protein can be equally convenient when you choose a powder that fits your dietary needs and provides enough protein per serving.
For people who experience lactose related digestive issues whey isolate may be easier to tolerate than regular whey concentrate.
If your goal is building muscle whey can provide a convenient source of high quality protein but your overall diet and training routine still matter.