No, the type of wiring does not effect HD picture quality.
Yes, U-verse has more HD channels than DirecTV.
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www.avsforum.com/avs-vb/ ··· 14422029One thing to remember is that with U-verse, you have a 30 day guarantee. You can have it installed and keep your DirecTV service. That will give you an opportunity to do your own comparison. At the end of 30 days, you can decide which service you want to keep. If you decide that U-verse is not for you, you can cancel all of your U-verse service and owe nothing.