I would say bottom line, if you are not riding on the track or just begining, i would go for a sealed hub. Gotambushed makes a good point, but if you are commuting, one day of rain can force you to take your Suzue Jr. hub apart to clean them, say it rains again on the second day, guess what you might be doing again that night.
If you just want to ride hassel free, sealed hub, if you are into Zen and art of Bicycle maintenance, cup cone hub.