I agree with most everyone’s answers. I prefer more simple pieces of equipment. Machines are great for beginners but it’s very temporary until they are comfortable with new movement patterns.
The type of equipment would depend on the type of facility you were opening and the type of clientele you want to draw. Do you want your facility have more body-builder clients? If so, you need more heavy-lifting apparatus. Sport performance? Studio?
My dream facility would be an open floor studio with equipment on the side for personal and group training, corner that’s fully matted for stretching, correctives, rolling, etc, and a separate room for larger classes (TRX, spin, kettlebell, barbell, stretching/rolling classes, correctives, etc). The idea would be to attract everyone from beginners-advanced, healthy and in rehab, using trainer guidance.
Barbells (15lb Olympic-style for beginners and youth as well as Olympic bars)
Boxes/steps at various heights
Functional Trainer (cable machine) with various attachments