Brock in the coveted 18-34yo male demographic.
overall, Ronda.
which is more valuable is debatable.
Top UFC events of all time. This was as of 2014 so its a little old but here it is. Keep in mind Lesnar only had an 8 fight career.
1. UFC 100, Lesnar and GSP on the card, 1,600,000 buys
2. Lesnar vs. Carwin 1,116,000 buys
5. (Tied) Lesnar vs. Velasquez 1,050,000 buys
7. Couture vs. Lesnar 1, 010,000 buys
http://mma-manifesto.com/root/ufc-ppv-data-root/top-selling-ufc-ppvs-of-all-time.html
Lesnar, he was a bigger PPV draw.