golf:

• wastes crazy amounts of space and water
• soul-crushingly boring
• extremely frustrating to all but the highest level of players (most golfers will never even shoot par)
• prohibitively expensive (golf clubs are very costly and one round of golf can cost $100+)

mini golf:

• 18 holes will fit into an area the size of a small park; most courses use astroturf, which doesn't even require water
• a fun game of skill to challenge your friends to
• easy to get into, but difficult to master
• cheap (you and your friends can probably play for like, $20)
• BONUS: cool obstacles and gimmicks (windmills, water features, secret holes, etc.)

Golf: completely fucking silent practically on pain of death

Mini golf: dunking on ppl while theyre taking a shot is pretty much required