I have my opinions, but I think this question will be best answered about 12-18 months from now. The LC and GX550 aren't even out yet.
A few notes:
The LC is hybrid only, and I don't think it will have any more maintenance requirements than the GX. Many Tundras and all of the Sequoia's are also hybrid. The biggest risk, that I can think of, would be corrosion to cables or connectors.
I'm not sure why people are afraid of hybrids. I own two, as well as a TTV6, and I like the idea of a single turbo w/ hybrid.
The LC and GX Overtrail are 2 row only. The GX is available with 3 rows, but not in Overtrail trim.