Purchase advice and decision support

Hello, I want to separate myself from my DB-A model and look for a not too boring but affordable small car (new car or day registration). For days I have been tormented by various tests on the internet with the result that I don’t even know what to buy anymore. In the narrow selection so far were Smart Fortwo or Forfour, Skoda Citigo and KIA picanto. Price presentation up to 12,000 euros. I am a single driver. Primarily short distances or city traffic. The new car should be reasonably environmentally friendly and sparing. I would like the smart most, but it doesn’t have the best reviews in the tests. Maybe you can help me further or on the jumps. Would be really great. Thanks in advance Seelöwin