Which country is better to visit between Ukraine and Russia?

Russia is better than Ukraine. During the Soviet Union, Russia was also the core country of the Soviet Union, and its capital was Moscow. However, Ukraine is safer than Russia, and the people are simpler than the Russians. As for the cost, it depends on where you go. As a city, Moscow is certainly not cheap.

In response to your additional question: Odessa and Dnepr are similar in my opinion. They are both second-tier cities in Ukraine. Odessa has the Black Sea and Dnieper has the river; the education level is also the same. It's on the same level; Kiev is relatively better. After all, it's the capital of Ukraine and the city is big.