Are chipper golf clubs legal?
Depends. There's nothing wrong with a club that looks sort of like a putter with loft. It can't, however, be usable from both sides. According to the rules: Appendix II, 4c states that: The clubhead must only have one striking face, except that a putter may have two such faces if their characteristics are the same, and they are opposite each other. This rule was intended to specifically prohibit clubs with two striking faces, but they made an exception for plain blade putters with two identical opposing faces.
The difference between the men's golf clubs and junior golf clubs is the age bracket that the golf clubs are used by players. Junior golf clubs are used by young players typically aged from 7 to 16 years old while men's golf clubs are used by adult players from 18 years old and above. These golf clubs come in different sizes and material to fit players properly.
Titleist clubs are a mile better than Cobra. You would class Titleist as premium clubs and Cobra just on the level below them. Saying that, Cobra clubs are still amazing golf clubs and have some lovely things on the market. If you are thinking of which golf clubs to get, you shouldn't really worry about brand names and get clubs you are comfortable with.