Not Recording Deed

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Spoke with an attorney the other day (who is apparently an investor too) and he is adamant about always recording the deed upon purchasing.  The reason being that if the deed is not recorded, what stops the seller from turning around and selling it again.

This piqued my interest as I have heard about Trusts (but know nothing of them, save for that they don't get recorded) and buying Subject To and not recording (to minimize risk of the due on sale clause).

These things seem to be in conflict and I'd appreciate any insight you might have that may enlighten me on the matter.

Thanks!