Opel astra k vs mazda3 nakama

Hi people, only 2 cars to choose from, what do you think about it? Profile: soon 1st child short distance city, insg.so 12000km per year (incl. holiday routes) should not be sold quickly again, first 10 years keep. Have the choice between astra k 5tür dynamic 92kw+Comfort for max 20000 and mazda3 nakama G-120 for 18500. both new car, gasoline, switch and sof.available. Gibs already discovered defects (Mazda and circuit..)? Are both new models. it the two. prices are I think okay to good or? Can’t decide, or I want Mazda and woman the Astra 🙂 Of the size they are quite the same and I think sometimes enough for a 2nd child maybe sometime. LG Matzn