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: 2P 6400 pack (5957 mAh vs. 5933); Energy: BL1860 (109 Wh vs. 21.48); Test current: BL1860 (20 A vs. 6.7).
Only in one review: Resistance 30 mΩ (BL1860); Temperature rise 77 °C (BL1860).
2P 6400 pack: Capacity is slightly below the rating; protection trips at 6.7 A, and measured capacity is 5957 mAh.
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.