I agree with MD on all points, and I do think that there is a difference between 720 p and 1080p. The comparison isn't between p and i, it is 720 and 1080.

However, the only thing that really matters is what it looks like to your eyes, with the input signal you will be using, in your ambient lighting conditions.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue