There is a reason why all modern cars have maximum track width within their bodies dimensions. You don't see deep dish wheels on any modern or exotic car. With older cars however suspension engineering was not so well advanced. As far as width vs track the two are not mutually exclusive because of the physical limitations of the suspension and dimensional limitations with your design (car).
Always go maximum track with maximum width rims and tyres that will fit and not foul. You then get rims made to suit and many brands such as Forgeline will make them to the offset to fit between your design chassis limitations.
Of course if you want to keep the 70's look of deep dish wheels then you can also get rims built to suit such offset, but it will not be maximising the your geometry benefits you have available within the physical body limitations.
Its the leverage principle as you increase the wheel centre away from the mounting point you are putting more stress on your bearings under load. Obviously geometry is not a light subject with simple answers as so many things come into play. However in basic theory without all the semantics of specific chassis suspension fouling the Max rubber contact on the road is the same regardless of the offset of your wheels. So if handling is priority then the modern design of max track is always superior. If it was not we would see 2014 vettes, vipers, ferrari's, lambos etc all with deep dish wheels.
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