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JPM FIG is top of the street afaik, alongside GS FIG which has been sliding down as the no. 1 FIG shop (exits are still top-notch). Generalist MF exits are definitely possible, although to a lesser extent compared to GS FIG. Regardless, a lot of it is self-selection and by no means will the group hinder you from recruiting for almost any buyside position (Generalist/FIG MF PE, UMM/MM PE, HF etc).

Can't speak to Citi M&A, but M&A groups in BBs have traditionally exited well to MF PEs. 

All in all, it really comes down to whether you want to be a generalist (take Citi M&A) or want to specialize in a specific field (FIG) + value a better brand name (JPM). Exits will be more or less the same from these two groups.