new model = 30 bhp more but also weighs more and has less torque + points include nicer interior embelishes a slightly different front bumper and a bonnet bulge, twin intake instead of single
old model = half the road fund licence, weighs less, more torque but 30 bhp down on the 308 bhp HR engine
difference between the 2 the newer model is more refined and smoother, the older car has alot more raw feeling to the engine; dfference between all 3 versions on the track = slim side of feck all, all 3 would cross within half a cars length of each other.
only real difference is the slightly nicer interior and extra bragging rights that yours has just over 300 bhp where the others have just under 300bhp.
there are more tuning options and after market parts for the older DE than there are for the HR