Well, I discovered that SBC flies into Grand Case, which is a plus for us. Normally, we spend some time on the french side of SXM and spend the next week in SBH or begin in SBH and end in SXM. For us, it would be a plus to use them and avoid the long cab ride from Juliana. I wanted to check them out this time since we did not visit SXM this trip but probably will next time.
Either way, we have had great luck with Winair every other time from SXM to other islands besides SBH. Upon booking this trip and reading opinions on this forum, SBC did save us some money and the flights worked out great, time-wise.
SBC was great about communication and the check-ins were flawless.