NO OFFENSE, You din't try enough!
1. True. It is some differences between them. The major one is that:
First cost 130 euro/floor; second= nothing (except work, passion and pleasure).
2. If You read more carefully on the Czech site You will see that is their job - to make professional presentation.
3. You can do this also if You try for 50 times and wait >24h each time to render something at high quality.
OR invest in professional windows licence (~500 euro) + an professional CAD for architecture program (5000~6000 euro) + same hardware for this (~ 5000 euro) + some training course (~ 2 to 3 years).
You see? Is very simple!
Good luck!
PS. I identify (partially) which programs was used and I'm not interested on it. Are closed sources, Windows only and a lot of investment. Is not my tip!