You're comparing apples to oranges here; a SC-sized HB will never sound the way a proper HB does simply due to the fact it still picks up the strings energy at a SC sized width.
P90 vs HB is a different story alltogether and the actual size of the "casing" is of no influence (as long as it is bigger than a stock P90 casing off course).
Dude I've got a set of P94s in my Les Paul Standard and love 'em. Very punchy. Yes, they are a bit noisy, but it's a gigantor single coil. It's not going to be silent. They play VERY well with Marshalls (I've got 2). Would I do it again? In a heart beat.