Main difference is in the performance. The 1.9 TDI has 2 valves per cylinder and is much slower than 2.0 TDI, which has 4 valves per cylinder. 1.9 TDI has better fuel economy than 2.0 TDI. The transmission and the suspension is the same on both. You have to take each for test drive and see if 1.9 TDI is fast enough for you. There is also difference in the price.
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