We have both Cybersource and Solupay. I could see Solupay being easy to setup if your needs are very simple and you only expect to have payments from US and/or Canada. But once your needs start to get complex, Solupay’s ability to handle that complexity really suffers. Solupay has almost zero written documentation about how any of their solutions work.
Cybersource, on the other hand, provides very little assistance or hand-holding, unless you are a very high-value client. Their documentation is quite thorough, though.
How will you be taking payments? Will it be upfront payments for goods and materials? Invoicing after the fact for good or services? Will customers pay through a NetSuite e-commerce site, your own custom site, or will they be calling in to provide payment via phone?