For your peace of mind, you need a solvent company in the technical section.
Each time the computers are faster and more powerful. However, depending on the type of work, a single computer will not be able to cover your expectations of speed and quality.
You can find many companies able to make still images. To make animation, the number of options goes down and, in this type of services, beyond considerations and stylistic finishing, the technical expertise is essential.
A company who can make great still images, at the same time, maybe, it could no offer to make an animation.
It happens with all applications, I don’t care whether accounting or 3d applications:
Each day, the learning curve of the applications is shorter, which does not guarantee optimal results. Within obvious limits, the quality of the work is defined by the workman not his tools.
You must appreciate the versatility of the human team.
If we talk about architectural visualization, I really recommend you that an architect would be your partner in the company contracted.
The architectural projects usually are not finished to the level of detail needed to be visualized. In order to take good decisions with these information gaps, you must have a human team able.