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IMHO, you have to decide what's important to you.

Leaving the shirt unbuttoned leaves a draw that is SLIGHTLY faster than lifting the shirt. It does take less practice to get comfortable with just sweeping your shirt with your strong hand and you have to practice the two handed technique with the buttoned shirt. OTOH, having the shirt unbuttoned will occasionally lead to the gun being flashed and you will at that point be OCing. To some, concealment is more important to them than ease of access.

There is validity to both points of view, you have to decide whats important to you. Ultimately, this is a relatively minor decision. If one way or the other will make you more comfortable carrying than the other and make it less likely for you to leave it on the nightstand........go that way!