Along with the one line Wallace and the Hoblitzell no stats the stray line version of the Moran card, the correct "suffered" of Wilhelm and the Mathewson error (only found on the Cycle) are especially difficult.
If you discount these variations that are purely based on the back of the cards and mostly correspond to the companies, the harder HOF cards are Joss, Wallace (without cap -- 2 versions); Collins and Bresnahan (open Mouth Vars.); Jimmy Collins (Minor League and thus Hassan Back) and Ed Walsh. The last one I'm not as sure about but I recall that card being considered more difficult back in the day.
I don't think Jennings has ever been regarded as hard to find.
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