Probably a whole boat load of factors to consider here:
1) type of receiver
2) how the receiver is mounted (welded, Grade 6 bolts, Grade 8 Bolts, number of bolts)
3) a receiver pin may be strong enough to pull from but are the holes on the receiver?, if you use a receiver with hook or shackle the major stress point should still be the pin.
As a choice between the two products, the warn is designed for recovery and would be my pick.
The PA tow ring is rated for 10,000 lbs towing not for shock loading.