I like all dragonettes and find all of them the easiest, least maintenance fish we normally keep. As long as your tank is set up for them and has some age to it. I think the ruby reds are the most colorful and you immediately see them when you look at the tank. I have 3 of them.
Like mandarins, they constantly spawn.
Mandarins have been in the hobby much longer and they are very similar but a little bigger.
I also have 3 of them.
They also constantly spawn
These guys are not very colorful and I only keep one of them so I don't know how easy they spawn.
I know the mandarins live at least 10 years but the ruby reds don't seem to live that long. Maybe 4 or 5 years but maybe thats just me.