As long as it's white tanks, downtown or thompson peak then no it doesn't really matter all traffic will come off of those towers so I'd just use which ever one comes in the best for you, for where you're at. Since my scanner just sits and provides a feed it kind of matter since I can receive both downtown and thompson peak. If I have downtown programmed in before thompson then the scanner will stop on downtown and not all of the voice channels are strong enough to be decoded clearly. This is on a 106.A bit off topic - but does it really matter what order you enter the CC's? (and I'm using a PRO-96 & 106) - I've noticed it tends to pick up the strongest control channel no matter where it is in the list (and I've changed their order several times).