There actually is a real answer to this question. The type of capstone project required for the doctoral degree depends on the regional and in the case of psychology, APA accreditation. Any regionally accredited university or college accredited by what is now known as the Higher Learning Commission must demonstrate that the required coursework feeds the capstone project. Thus, it could change from a dissertation to art project to robot depending on the nature of the curricula.
In the case of APA, all schools identify their own "model" in their self study. A scientist-scholar on the one end and scholar-practitioner on the other. If a program (most PsyDs) identified the scholar-practitioner model to APA and then REQUIRED all students to complete an empirical-design dissertation, they would need to demonstrate the level of coursework to support that (most have 2-4 stats/research methods courses and dissertation from 3-9 credits). If they have few stats/rm (say 6 credits) they would be in trouble with APA if they REQUIRED an empirical design. There are also questions of faculty teaching load, access to data, publication requirements, but you get the idea.
Your choice of program should reflect your goal in this area as in all others.