Wired Ethernet is the gold standard. In decreasing order of speed and reliability, I think you're looking at:
1. Wired Ethernet
(Although I'm not sure about 2 vs. 3, since some Powerline adapters claim 500 Mbps now.) The advantage as you go down that list is that you're reaching more locations -- Ethernet has to be wired specifically, MoCA reaches every TV port, Powerline reaches every electrical plug, and WiFi goes anywhere within range.
Given that you say you already have Gigabit Ethernet, I can't see how there could be any advantage to MoCA. Even if you had only 100 Mbps Ethernet, the TiVo can't max that out anyway, and you could always just upgrade the switch. The worst-case scenario would be if your Ethernet was miswired, limiting you to 100 or even 10 Mbps. But even that's pretty easy to fix.
How I could be wrong: If the TiVo can do more than 100 Mbps over MoCA, but has only a 100 Mbps Ethernet port, and if you can get more than 100 Mbps out of it via multiple simultaneous transfers (since I know you can't do it with just one), then in that scenario, there could be an advantage to MoCA. I don't think this is likely.
Edit: The regular Premiere doesn't have built-in MoCA, so it would require an external MoCA adapter, and be limited by its 100 Mbps Ethernet port anyway. The Premiere 4 supposedly has Gigabit Ethernet, which should be faster than its built-in MoCA.
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Last edited by wmcbrine; 03-06-2013 at 10:04 AM.