Converting to DNG - which Camera Raw compatiabilty and why?

When converting camera Raw files in Lightroom 2.5, a dialog box asks which Camera Raw/Photoshop version I want to make DNG file compatible with.   (See my screengrab below) I understand why Adobe made different vesions of Camera Raw and stopped supporting older versions (so users would buy the upgrades of Photoshop and Lightroom).  The question I ask.. Does a DNG file created to be compatible with Camera Raw 5.4 have superior qualities/algorithms/technical mumbo jumbo/ finese /or what not over a DNG file created to be compatible with Camera Raw 2.4 and later?
Seems sort of silly to not use the 2.4 setting if 5.4 has no advantage (other than keeping older versions of Photoshop and Lightroom from opening it ).
What is the scoop?

Camera Raw does evolve over time. There are changes to the rendering algorithms. Additionally, new camera support is added with each new iteration of Camera Raw. The older versions are offered so that if you are still using older versions of Camera Raw and Photoshop you can generate compatible DNG files.
If you are using current versions then I suggest you choose the most current version in the dialog box. If you are still working under ACR 4.6 then choose that. It's there so you aren't "forced" to buy upgrades to PS and LR.

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