I feel more secure with a double uni-knot myself. Bloodknot is OK if you KNOW it is right.

The reason for this is not just that the uni is easier to tie but because braids and mono are DISPARATE materials. When you tie a double uni you are actually securing the braid to itself and the mono to itself and letting them slide down on each other to lock up. Knots are always stronger when they can seat to the same type material. Hope this helps.
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Matt. 8:27   The men were amazed and asked, “What kind of man is this? Even the winds and the waves obey him!”