artificial-ignorance wrote...
All Unlockables || # || Probability (Rounded)
Other Unlocks 1584 93.3%
Ultra Rare Weapons 106 6.7%
SP Unlockables || # || Probability (Rounded)
Other 156 92.3%
Ultra Rare Weapons 13 7.7%
PSP Unlockables || # || Per Rare Card Per PSP
Other 586 92.3% 87.7%
Ultra Rare Weapons 45 7.7% 12.3%
RP Unlockables || # || Per Rare Card Per RP
Other 387 90.4% 82.5%
Ultra Rare Weapons 37 9.6% 17.5%
AP Unlockables || # || Per Rare Card Per AP
Other 155 92.9% 86.7%
Ultra Rare Weapons 11 7.1% 13.3%
TOTALS
#SP's = 169 (10,140,000 credits)
#PSP's = 367 (36,333,000 credits)
#RP's = 212 (20,988,000 credits)
#AP's = 83 (8,217,000 credits)
Total Credits Spent = 75,678,000 Credits
Credits Per UR (All) = 713,943
Credits Per UR (SPs) = 780,000
Credits Per UR (PSPs) = 807,400
Credits Per UR (RPs) = 567,243
Credits Per UR (APs) = 747,000
Therefore: RPs have the greatest UR drop rate (17.5%) out of all packs.
Is that a large enough sample size for you? This is actually a small sample size compared to the amounts of data you can find- all pointing toward RPs as the highest UR drop rate. The search feature is an amazing thing. Ignorance is not.