My periodontist said it is completely my own decision whether to have a single #4 upper right dental implant by conventional loading or by immediate loading. tooth extracted next week. how to figure this out?

Your periodontist needs to explain the pros and cons of the two different treatment methods. They can't possibly expect a layman to make such a decision without dental knowledge. It's called informed consent, and apparently you haven't been informed.

Once you have discussed both procedures wither Periodontist, then ask all of the same questions to your General Dentist or Prosthodontist,t he Dentist who is responsible for the cap that will be placed on the implant.