Kodak 120 Tri-X pan and 400 pro development

Hi! I have an old Rolleiflex E (1957) and now would like to ask about development and other differencies for a couple of 120 films (Kodak). I prefer using D76 1+1 at 20 degrees C and about 10 min (plus/minus a minute or two depending on the subject exposure and so on). Kodak gives no recommendation for Tri-X pan ISO 320, but does so for Tri-X 400 pro ISO 400, when using D76 1+1. Now my question: Must I use D76 undiluted when developing Tri-X ISO 320. Is there differecies between 1+1 and undiluted that cause som kind of bad things to this film but not the other? Some experts out there? Final question: Which film of this two is regarded the best? Some other film recommendation? Thanks in advance. Lars

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