vs
QUICK ANSWER
"Pista" is a form of "pista", a noun which is often translated as "road". "Circuito" is a noun which is often translated as "circuit". Learn more about the difference between "circuito" and "pista" below.
el circuito(
seer
-
kwee
-
toh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
la pista(
pees
-
tah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
a. road 
Había huellas de neumáticos en la pista que bajaba de la montaña.There were tire marks on the road that led down the mountain.
2. (trace)
a. trail 
Sus perros solo pudieron seguir su pista hasta la frontera con México.Their dogs were only able to follow the trail as far as the Mexican border.
3. (hint)
a. clue 
El inspector encontró una pista en la escena del crimen.The inspector found a clue at the crime scene.