Tom,
I do not own a DT bar, so please correct em if I am wrong.
True the DT bar never needs replacement, but it may need to be rebuilt correct? I know DT sells rebuild kits for the bar, or do they give them away as a warranty part? Either way something wears out and needs attention. Same with the Moog. Eventually it will wear out. Take it off and get a new one. Simple as that.
Don't get me wrong, from what I know about it I think the DT bar is great, especially for a lifted truck, but on a stock truck I don't quite see how it would be utilized to it's potential. In that case, I think it is hard to beat the Lifetime warranty Moog bar. JMHO.
Take care,
Ryan