Assignment
A transfer of all interest in a property.
Transferee has privity of estate NOT privity of contract with obligor (both liable for all covenants that run with land)
Transferor remains secondarily liable
Sublease
Transferor transfers less than everything.
Landlord and transferee are neither in privity of estate or contract.
Transferor is liable to Transferee and Transferee is liable to Transferor