In theory I think Democrats are better than Republicans because they tend to embrace liberal values that include rather than exclude others. However, in practice they are both political parties and politicians tend to do things for reasons that those of us who are not do not understand and would never want to be part of.
The Republican party is dominated by plutocrats. They are just interested in keeping their money in the hands of the few. Democrats generally try to help the people. The Democratic party is more populist. The GOP is the party of fat cat businessmen and conservative Christians, who often promote ignorance and racism.