In the past I have grown Sungold and Crimson Crush in pots in a row ... none of my tomatoes succumbed to blight that year.
I find sungold to be quite resistant as well.
Growing a non resistant plant near a resistant one will increase the chances of losing the lot. The plants are only resistant not immune, so if the non resistant one catches it and you don't remove it in time you add a lot of extra infection chances to the resistant one.
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