Two models side by side: measurements taken by the author in their reviews, and their conclusions. The better value in each row is highlighted.
In brief: Based on review measurements: Capacity: BL1860 (5933 mAh vs. 4795); Energy: BL1860 (109 Wh vs. 88.43); Test current: BL1850 (30 A vs. 20); Resistance: BL1860 (30 mΩ vs. 35); Temperature rise: BL1850 (74 °C vs. 77).
BL1850: A pack with genuine high-current cells delivered about 4,800 mAh; the author says it is worth buying.
BL1860: The Samsung 30Q-cell pack delivered its claimed capacity and pleased the author more than the previous one.
Figures were taken from the review text and checked against the quoted passages. Measurement conditions differ between reviews, so read the reviews yourself before buying. Prices at the time of review.