both companies owned by Corteva. pull from same pool of products to add to their lineups. corn i'm confident to say they do not share hybrids but definitely share males and females. soybeans, i'm not as confident to say they do not share any varieties but they again pull from the same genetic pool and breeding programs at Corteva. 

IMO choice comes down to dealer preference probably. 

I buy my corn and sell corn for another corteva company. I have a good relationship with that regional rep above me. its preference for me to deal with them. pricing is similar enough. Brevant is from retailers and pioneer from a Pro Rep style sales force. advtanges and disadvantages to both. 

good products for me in indiana.