IMHO: any customer needing to “more better” control Quality of Service for voice and/or prioritize any other application over general traffic.
Any customer needing solid, uninterruptible, up time, and/or seamless redundant ISP failover
Any customer looking for “better than VPN” option for their WAN, but can’t spend the money for an MPLS.
bottom line: just about any customer 🙂
(depending on the SDWAN provider, of course. there are big differences in offerings, even from 2 different providers both offering “VeloCloud” or another primary SDWAN option.