Hi,
A rather vague question.. don't know what you are after.
Generally a transistor is a discrete semiconductor part.
A schmitt trigger is a circuit consisting of several electronic parts. To build a schmitt trigger you need transistors.
(I guess you already did an internet search ... )
So it's like comparing a brick with a house.
About current consumption. Depending on the circuit and the part values a transistor may consume from zero to extremely high current.
But usually a transistor is not used to consume current, but to control current.
I guess you have an idea in mind or have read some documents ... please give links to them and ask a more detailed question.
Klaus