The Language Closest to PIE

I voted for Lithuanian, but don't really know enough to say if this is the right choice (but among the choices, it seems best).

Lithuanian is said to be the most grammatically archaic of all the IE languages, and you often see examples of how transparantly cognate Latin and Sanskrit are to the modern language.

At the same time, I gather that Lithuanian has some *extraordinary* innovations, mostly from its encounter with Uralic. For a while, it seems to have borrowed a whole suite of Finnic cases. And what is it, the inessive? the one that replaces the locative, is still with them. This might be cited as evidence for making Lithuanian the most unlike PIE.