I've tried several and the best I've found is Boothill.  I buy the pellets in place packs and tear them open before I put them out and they seem to eat it better.  As long as I keep it out, they eat it and die!!!

https://www.qcsupply.com/boothill-90-count-pellet-place-packs.html?gclid=EAIaIQobChMIgbK_-7DD3gIVhTlpCh1ySgv2EAQYASABEgKNm_D_BwE