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The red/blue is a bit more obvious and noticable.

The red/black is more subdued and suitable even for an up-scale event..(my personal favorite)

You should know what dolors lyour boyfriend is comfortable witih..

If I were pushed, I would agree that the red/blue should be the one chosen for a gift lacking any other input; as has been said, if he wants another insert, they can be found for less than a 100 bucks.