I have 2 implants right next to each other on teeth 29 and 30. I'm wondering what is the best way to do the crowns?

I have 2 implants right next to each other on teeth 29 and 30. I'm wondering what is the best way to do the crowns. Single crown on each or both of them combined. Single crown will allow me to do them on different years and will work out best cost wise. But if it is not advisable or there is advantage strength wise if we have a combined crown, I'll consider the later even though out of pocket expenses will be way higher. I have a max ins. cap of 1500 per year. Thanks.