Why are the saturation regions of BJT and MOSFET differently defined?

[Kashyap Cherukuri]

The characteristic curves of both BJT and MOSFET are similar. But a BJT is said to be in saturation when VCE ≤ 0.3V. A MOSFET is said to be in saturation when VDS > VGS - VT.
Why are they differently defined when currents are getting saturated(meaning literally) in both the cases?

 

[sam185]

mosfet have ohmic region while bjt doesn't.
Hence mosfets i/p is voltage controlled while bjt i/p is current controlled.