I'd say that Prague is actually cheaper than Brno, as you can very easily earn more there, and you can get food for pretty much the same price in the same chain

I'd say that Prague is actually cheaper than Brno, as you can very easily earn more there, and you can get food for pretty much the same price in the same chain store, public transit fares are almost the same, rents outside the city center are comparable, even better in Prague, as there is much more choice. (I live in Brno.)