Why not both?, to me the journal is more personal, those are notes for me and probably wouldn't make sense to other, you can write things like "remmember the dumb thing you did the last time", well, the last time maybe is another project so is not relevant to others in your current project. In code comments you "translate" the journal entry in a concise and understandable version of it. In the journal you also keep discarted, dumb, far-fetched ideas and you can write 5 pages if you want, I don't care about all your process in the code and definetly not 5 pages of it. I even think that write it up in the journal first will even make better comments in your code after articulate the idea in the journal.
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Why not both?, to me the journal is more personal, those are notes for me and probably wouldn't make sense to other, you can write things like "remmember the dumb thing you did the last time", well, the last time maybe is another project so is not relevant to others in your current project. In code comments you "translate" the journal entry in a concise and understandable version of it. In the journal you also keep discarted, dumb, far-fetched ideas and you can write 5 pages if you want, I don't care about all your process in the code and definetly not 5 pages of it. I even think that write it up in the journal first will even make better comments in your code after articulate the idea in the journal.