Prefabricated houses have the great advantage that the house is usually standing within 1-2 weeks because the prefabricated parts are simply delivered and lifted into the right place by crane, and the construction workers only have to connect the parts. This is of course not possible so quickly with brick-by-brick construction and is also highly weather-dependent. In heavy rain, frost, etc., some work cannot be carried out, and since brick-by-brick construction involves various craftsmen, subcontractors, etc. (of course, most architects also offer construction management services and basically take care of it), it often takes longer than expected because construction breaks occur repeatedly. Either a part is delivered late, or a subcontractor has to reschedule appointments... With prefabricated house construction, appointments are also made, but since the overall construction period is significantly shorter and the companies always work with the same suppliers (whom they know well), the chance of delay is significantly lower.
And once the shell of the building is standing, the subsequent effort for prefabricated and solid construction is the same anyway, such as flooring, electrical work, pipes, plastering and painting...
In terms of price, there is not much difference between prefabricated and solid construction. And where prefabricated houses are a little more expensive, you usually make up the difference quickly because you stop paying rent earlier when the house is completed faster.