As long as the internet connection is stable, any internet is ultimately fine.

Wifi: Buildxact should run fine on WiFi providing you are close enough to the router and the WiFi is reasonably strong. Your home or office will generally be strongest.

Wireless dongle: Outside of your home or office you can use a wireless dongle.

Phone as a hotspot: This will also work, though we recommended a dongle over using your phone as a hotspot because the internet provided by a dongle is much more consistent/uninterrupted, with less dropouts.