Of cars and roses

On Xmas eve, I woke up early to follow my mum to the morning market. There was this tea leaves stall and being that teaholic, I went and check out that stall.

R: Rene
T: tea seller

R: so what's the difference between this two rose buds?

T: one is BMW and one is Proton Saga.

His answer was really clear. I wish that I have that ability in explaining things!