Michkov > Demidov
I'm not sure of.
I don't wanna look like a homer here, but Demidov seems to be a more complete player.
Bigger, more involved away from the puck, better defensively.
He might be less of a pure offensive contributor, but he's more of a multidimensional player.
As for Reinbacher, he's not a stats watcher kind of player but in terms of overall play, he can do it all.
He's big, he skates well, he's reliable defensively and have the tools to contribute offensively, but his priority is his defensive play.
He's the kind of defenseman that eats a lot of the tougher minutes while still contributing some offense.
I see him as a +/-23 minutes defenseman that produces around 40-50 pts/season while playing against opposing top players.