Is it better to use the 192.168.x.x or 10.x.x.x address range for a small business network?

RFC 1918 may offer you some guidance on this. At the end of it all though, you’ve got to design your network to suit, well, your network. If you’ve only got ~50 devices on the network, then any /24 (255.255.255.0 netmask) will more then suffice

What do you estimate your growth to be? Will a /24 suit in the future? That’s a consideration you need to take into account

The performance side of things, I’d probably leave any performance impact to be theoretical. And management, well, that may depend on the tool used. Are you just considering IP allocation. Will DHCP work for you? Do you plan on having statically configured devices? You IP address management may start in the form of a spreadsheet. It may be more elaborate, and be database backed. You may want to tie it in to a NMS or something. There’s a lot of scope in this area

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