Can't comment on the differences of the two, but if you bear in mind, it's essentially a Grand Tourer, more designed with open, Alpinesque type drive, but can do the trick on the twisty bits as well.
I believe from other 350 to 370 drivers that it's a more refined drive and, yes, an aftermarket will make all the difference, don't know a car that this is not true to be honest excepting exotics.
I've just returned mine to stock, from having a full Akrapovic Evo exhaust, HFC's, and UpRevved , also back on original springs from Eibach Pro's and I.m currently running Sessanta Ultracs, (good quality tyres IMO), and do you know what? I'm thoroughly enjoying the stock feel
While all the mods added to an experience over stock, the biggest improvement, to handling, was the Eibachs, totally transformed the feel and made it so flat in a bend.
But Badgeronimous is correct about our Scottish roads, very, very inferior, and in the end the Eibachs were getting a bit on my nerves, due to this.
The cabin has a black roof lining? I've had mine three years and couldn't have told you this . With the right aftermarket exhaust, the synchro rev is outstanding and really Nissan missed a trick here, or were very smart, throwing the aftermarket industry a nice earner