What is the difference between the system of reservation of constituencies and the system of separate electorate? Why did the Constitution makers reject the latter?

There is much difference between the system of reservation of constituencies and
system of separate electorate:
Separate electorate system:
 It has been a curse to India.

 The British started this system to divide votes between the Sikhs, the Muslims, and
some other minorities.
 These groups elected their own representatives by separate vote.
 In separate electorate system, the candidates are elected by those voters, who
belong to that particular community.
System of reservation of constituencies:
 All voters are eligible to vote.
 Candidate must belong to a particular community for which seat is reserved.
 The constitution provides the reservation of seats in the Lok Sabha and the State
Legislative Assemblies. The constitution-makers rejected the latter because they
were aware that the system of separate electorate destroyed the spirit of national
integration.