What are the features of the similarities and differences between Western European and Slavic states?

The occupations and structure of society among the Slavs of the middle of the 1st millennium A.D. e. had much in common with the Germans: tribal organization with an important but diminishing role of the people’s assembly, the strengthening of the power of the military leader-prince, who relied on the squad, raids on neighbors for the sake of glory and military booty. Unions of tribes arose. Some of them became the basis of the first Slavic states. First of all, at the end of the 7th century, the Bulgarian state emerged. In the 9th century, Great Moravia appeared to the north-west of it, Russia to the northeast; in the X century – the Czech Republic and Poland. States are also formed by the Serbs and Croats.
The Slavic states arose in the conditions of acute religious and political rivalry between the Frankish state (and later – the Holy Roman Empire) and Byzantium. Both empires sent missionaries (religious preachers who spread their faith) to the Slavic lands. The fate of the country largely depended on which version, western or eastern, Christianity would be adopted. The rulers of the Slavic countries were faced with a difficult choice between Rome and Constantinople.