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I haven't kept the doves you are asking about. I tend to think there isn't a beginner bird. They all require patience, daily care and behavioural understanding.
I think you need to be the one who makes a choice between the two. You will be spending the most time with them.
Only my thoughts hopefully another will contribute
Rinngneck doves are less "skiddish " than diamond doves and can be kept alone, as long as you spend alot of time with them, Diamond doves do better in pairs.