Wrong

Vietnam is the one who has the most militarized island is SCS

Republic of China (Taiwan): 1: Taiping 2: Zhongzhou

People's Republic of China: 3: Yongshu 4: Meiji 5: Zhubi 6: Huayang 7: Nanxun 8: Chiguo 9: Dongmen

Philippines: 10: Flat Island 11: Lankiam Cay 12: Loaita Cay 13: Loaita Island 14: Nanshan Island 15: Northeast Cay 16: Thitu Island 17: West York Island 18: Commodore Reef 19: Irving Reef 20: Second Thomas Shoal

Vietnam: 21: Southwest Cay 22: Sand Cay 23: Namyit Island 24: Sin Cowe Island 25: Spratly Island 26: Amboyna Cay 27: Grierson Reef 28: Central London Reef 29: Pearson Reef 30: Barque Canada Reef 31: West London Reef 32: Ladd Reef 33: Discovery Great Reef 34: Pigeon Reef 35: East London Reef 36: Alison Reef 37: Cornwallis South Reef 38: Petley Reef 39: South Reef 40: Collins Reef 41: Lansdowne Reef 42: Bombay Castle 43: Prince of Wales Bank 44: Vanguard Bank [zh] 45: Prince Consort Bank [zh] 46: Grainger Bank [zh] 47: Alexandra Bank [zh] 48: Orleana Shoal [zh] 49: Kingston Shoal [zh]

Malaysia: 50: Swallow Reef 51: Ardasier Reef 52: Dallas Reef 53: Erica Reef 54: Investigator Shoal 55: Mariveles Reef

Brunei: 56: Louisa Reef

China has the biggest militarized man-made island which is their unsinkable aircraft carriers

Among all the "islands" in disputed SCS, the one that can really be considered as a real island is Taiping island which is occupied by ROC