The Worst Strategy You've Overheard at a Table

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like there is this HUGE difference between playing JTo and JTs. It's like what, 2%, equity against a random?

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There is a non-trivial difference. For the same reason 27o is the 'worst' hand even though it dominates 23o.
Although your equity vs. random hands doesn't differ that much, JTs can hit flops harder.
When you're playing JTs against a PFR, you're almost never happy with just 1pair, you're playing the hand as a draw. JTs has a much stronger draw than JTo.