Diddy 's circumstances will only improve if he's sentenced to more time ... because he's probably headed for a prison better than his current one, a prominent consultant says.

We spoke with Sam Mangel -- a former convict who now works as a prison consultant for well-known figures -- on "TMZ Live" ahead of Diddy's Friday sentencing ... and we asked if he thinks Diddy's profile and the nature of his case will make him a target. Gallery Launch Gallery Getty

Mangel tells us Diddy's prospective prison will be a huge improvement when compared to MDC Brooklyn -- the prison where Diddy's been locked up since his dramatic 2024 arrest.

MDC Brooklyn is notoriously rough, Mangel says ... unlike the low-security prison where they're likely to send him after sentencing. Play video content

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