Depends on what you're looking for. Rails or "kickers".
Either of the two can provide a tiny taste of rails or "kickers." As I live south of Hemel I'd go there, but only if I've got enough spare cash for the rest of the month. MK is a little further north for me, but I'd be spending almost half the amount on slope time in comparison.
I'm not going to voice my opinion anymore on either of the two slopes, as I could go on for days.