Buy what you like. The Z is pretty damn fine out of the box, so mods aren't really necessary to get great performance. Most common performance mods are cat-back exhaust, high-flow catalytic convertor & improved intake. This car responds well to these bolt-on mods. Most common other mods are cosmetic: wheels especially.
The Genesis coupe is a fine effort, but really needs some mods to up its performance. Overall, it is more practical, more storage space, and so forth. But really it has no performance heritage, no racing cred, and the buyer base is much more female (not a bad thing when it comes to insurance).
If you really want a SPORTS car, the Z is the only choice in this price range, unless you buy a used Boxster, or Corvette or something. The Genesis coupe is more rounded, but won't deliver as well without mods if you have a real Jones for performance.
HTH!
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