Interesting question,
neither is the obvious answer, but I suppose KP, since KP hasn't managed to get herself thrown into jail and (unless I've missed something she) hasn't done any illegal substances.
I don't watch those Katie Price shows but every now and then I catch snippets and I can appreciate why she does people's heads in. Lindsay Lohan scrubs up in less of an obviously brassy/tarty way than KP and I guess Lindsay Lohan, has more of a profession than just getting her tits out and arguing on TV. Now I come to think of it, Lindsay Lohan for most things and Katie's (lack of) criminal record if I could be picky.
Looks like I've changed my mind while writing this message!