Advice on how to decide which microneedling device to buy

Hi all!

Posting for my mom who is planning on opening a small medspa.

She is thinking of investing in a microneedling device. She has a couple of brands in mind but wanted to know what she should think about when deciding on what to purchase.

What are the deciding factors you have/had in mind when you got your microneedling devices and what are some brands we should look into?

Thanks in advance!