Based on our record, SAP Cloud Appliance Library seems to be more popular. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Access to test/trial systems: there are trial systems on SAP CAL but not everyone can cough up 150$/month idle + 4$ per hour (S/4HANA 2021 trial with Google Cloud, according to the cost estimator). There are somewhat shady companies in India offering remote access but I know some people even in the US use them because it's way cheaper and convenient. (I don't endorse such companies and don't have any details.). Source: over 1 year ago
One point though: C4C is especially bad with regards to access. With other solutions, SAP is much better. You can spin up an entire SAP cloud infrastructure with S4 and cloud integration on https://cal.sap.com/ and the BTP trials. Source: over 2 years ago
You can easily spin up an S4 system to look around at cal.sap.com. Source: about 3 years ago
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