As someone who owns both of them I'm going to have to recommend going with the 325i. If you wanted to just do a simple restoration then either one, but if you want to modify it then you are kind of forced to go RWD.
*Also the ix parts can be expensive, but I've spent much more on my 325i than my ix just because of mods.
*Also the ix parts can be expensive, but I've spent much more on my 325i than my ix just because of mods.
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