Warranty Deed vs Quit Claim Deed

[Shaun R.]

This question may require an attorney's expertise.  I am transferring two (2) properties that are owned personally by me into LLCs which are controlled/owned by me.  I have heard this is most often done via a QCD, but also have had people recommend that I do it via a General Warranty Deed.  Which is the correct way to do it?  Is one method of transfer preferable to another?  Is there anything which would prevent me from transferring via a General Warranty Deed?