There is more to it than that. Generally you are deciding between compromises. For example, if you are placing an implant in the #30 position the bone and tissue will aftophy after extraction and the bulk of the attached gingiva is on the midline or more lingual. So the implant needs to be placed more to the lingual to split the remaining attached gingiva to the buccal and lingual. The implant crown access will often end up to the lingual if the central groove.