I,ve got myself a mocal 16 row oil cooler to fit on my 3dr.
But in my case one of the previous owners removed the modine and replaced with nothing . If its a fast road car the modine is probably sufficient imo but if track days etc then probably better off with 16/19 row mocal or similar cooler.
With the modine oil will probably get upto working temp from cold a bit quicker as it exchanges heat from the coolant into the oil.
My preferance is definitely a seperate cooler however as youre not putting that heat energy into your engine cooling system to deal with imo giving a bit more headroom on those hot summer days.