According to most farm web sites I googled, the Tamworth breed seems to be the choice for bacon. Here's a quote from Pig Paradise Farm.
"The Tamworth is one of the great ‘dual purposeâ€[emoji]8482[/emoji] pigs producing stunningly good pork as well as equally tremendous bacon. In the mid 1990â€[emoji]8482[/emoji]s the Tamworth came top in a taste test carried out by Bristol University using both commercial and rare breed pigs in a scientifically controlled experiment. It was later suggested that further investigation should take place to establish just what it was that gave the Tamworth meat such a distinctive taste putting it way above all the other breeds."[font=Verdana, Arial, Helvetica, sans-serif]
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