The quick answer is: either one.
If you're not planning on adding any HDD drives, use that one. More information on this can be found on Page 32 of the user manual.
Have a brand new 46" 7100 LED television...does the wireless Samsung Linkstick go in the USB 1 port or the USB (HDD) port? Is the USB (HDD) only for thumb drives and other drives with info contained within the actual drive itself? I am assuming that when properly placed, it is used in the regular USB drive and not the USB (HDD) drive...correct?