Several manufacturers have tips or openers specifically designed for certain soil types like heavy clays. Make sure that the opener you chose are designed to work in those conditions. Row spacing can also influence opener selection. Although low disturbance openers combined with wide row spacing can have a positive effect in reducing certain weed populations, it can cause problems if you don't straight combine. However, a wide row spacing improves residue clearance.
Cost is a factor as well.
Dual shoot openers are more expensive than single shoot types. However, after the capital investment, usually only replacement wear parts need to be replaced. Whatever opener you choose, make sure that accurate seed placement will be achieved. Ensure that the packer width matches the opener and provides adequate seed to soil contact. Remember, the opener is only one component of the whole direct seeding system.