Engine purchase advice

Hello dear forum community, I am still a driving student and would like to buy my first own car next winter. The Honda Jazz 3 would be short-listed due to its reliability and practicality. However, I am inconclusive with the motorization. My budget is approx. 8000 euros; for this, the Internet contains both 1.2 and 1.4 engines with appealing equipment and compatible mileage. Is between the two engines a A clear difference that justifies a possible extra price of 1.4? How do the real consumptions of the two differ? Does the stronger engine suffer from economic efficiency (tax, insurance, etc.)? And what monthly total cost would I have to expect? Thank you in advance for all the answers!