as long as it stays within the boundaries drawn by the original lease agreement between the landlord and original tenant.You are the Landlord - A lease assignment is recommended in most cases.
You are the New Tenant - An assignment of lease works better for you most of the time.
You won't be at the mercy of the original tenant (for example if he screws up and the landlord terminates the original lease agreement, your sublease might also go up in flames).
The original tenant has an unexpired lease agreement with the landlord and he wants out.
Since the original tenant can't just break the agreement and walk off, what he does is to get a new tenant to swap places...
If the new tenant stirs up trouble, our dear original tenant will find himself in hot soup as well.
Of course, whether the original tenant is allowed to pull this assignment trick out of his hat is a whole new matter.Knowing for sure is actually simpler than most people think: First, examine your local landlord tenant laws for any lease assignment rules.Most of the time, landlords are given the right to allow or disallow assignments but once in a while, the local law let tenants have the final say instead.Instead the original tenant plays mother goose and is responsible for collecting rent from the subtenant and making sure that he's following the lease rules.When you compare the two, a sublease is a lot more hands-on for the original tenant.But if you only want to rent part of the property...or don't want to tie yourself down for the remaining lease duration, then you are better off sticking to a sublease.Sometimes even real estate professional get it wrong by assuming them to be one and same thing.However if you dig deeper, you will find that the differences are not just numerous, but important as well.When you have a lease assignment, the terms and conditions of the lease remains largely unchanged - It's almost like taking the original lease agreement and swapping the tenant's name with another.With a sublease, there's more breathing space - The original tenant can decide how much rent to charge, how long the subtenant is going to stay or even collect security deposit...