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Mostly, the advantage lies in having the 'talk' button in an area on your body which is both quickly and easily accessible while keeping it out of the way of any other gear. It also creates a wiring hub which allows you to run cabling in such a way that keeps it out of the way as well (i.e: PTT goes on off-hand shoulder/ chest region, off-hand has little travel distance between the PTT and your weapon system, main hand stays in a ready-to-fire position on the weapon system without interruption, wiring is tight to your PC/ LBV and is less likely to snag on twigs, mags, your elbows etc).
With standardized PTTs of decent quality you can attach your radio, the PTT, and their shared wiring to your plate carrier or LBV more-or-less permanently, leaving the headset and radio as their own separate entities. This is good for your range of movement, as well as allowing you to hot-swap headsets and radios or affect adjustments/ repairs on the fly without forcing you to dismantle the entire system.
The advantages of clarity and reliability are a direct result of the quality of the PTT itself, the quality of the wiring, and the type of connector at the PTT-> radio endpoint (smacking a PTT may be a sign of poorly soldered/ worn out connections, Motorola Single Pin carries everything on one tiny prong and is therefore terrible by nature etc).
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