Here's my opinion, and it depends on whether or not u have an OTA module. I'm also assuming that you have only one Hopper.
If you do not have an OTA module, and you have even one show on a major network airing during each of the three hours of Primetime, you may as well use PTAT, because that one tuner is going to occupied, whether your recording one network or all 4 of the big nets.
If u do have an OTA tuner, you can get away with disabling PTAT in the above scenario. Now, if you want to record on two major nets at the same time, it again makes sense to just have PTAT enabled.
Of course, as mentioned by others, PTAT gives you the added feature of auto-hop, and it'll also pick up the random show you may not have set a recording for (awards shows, live events, etc.)
Hope some of that made sense and helps you out!
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