To the OP, please give more details about what you want us to vote for.
Are you talking about the value to the team NOW? Or on the long term? This will change how Galchenyuk is ranked.
Are you talking about the value on the trade market? If you are, then should we consider their contract situation and age? This would change how Markov is ranked.
Are you talking about which players has more value for us, the fans, or for the management? This will make a big difference between DD being #9 or #19, for example.
Without those indications, this poll won't have much value. Good idea, otherwise.