Big vs Small pot & Size difference Lavender (tip)

So here is a small and big pot planted Lavender.
So this would have to be something with the root system?. Just to let you guys know bigger pots are obviously better

I don’t think pot size has ever been a question of whether size dictates plant growth. Look at a tree. It would never grow as tall or big if it wasn’t in the ground. So yes, the bigger the pot, the bigger the plant.