Most of the carts i choose fall into that 8hz to 12 hz frequency.Sigh, isn't that exactly what I said above? Choose any mid-weight cartridge (most of them) with medium compliance (most of them) and you'll be fine. The Denon is low compliance, which is why it falls outside the range.
Now, is there such a thing that 8hz is better than 12 hz or vice versa ?Oy! Please read what people have already written.
If you're between 8 and 12 you've avoided a "gross mis-match". You're neither so high that the cartridge is likely to be excited by musical information on the record (which tends to be at 16Hz and above) nor so low that the cartridge is likely to be excited by footfalls or resonances from the floor/stand (which tends to be at 6Hz and below).
As Syntax, Raul and I have suggested, that is ALL this number can teach you. There is no "better" between 8.5 Hz or 10.3 Hz or whatever. Stop obsessing about numbers. Start finding out how different cartridges sound when playing music.