The TRR8 would probably be the better choice of the two based on the limited information that we have. We don't know what type of holster you're using with your 627, but some holsters are not very accommodating of rails. The TRR8 allows you to remove the rails while the M&P R8's under barrel rail in integral to the barrel shroud. I do have to admit a slight personal bias here as well as I think the rails are ugly as sin.
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