Catalogue & checkout
JTL-Shop
Unlimited articles and integrations to all popular payment providers are the only merchandising facts on the evidence; the checkout itself is never evidenced. Nothing on variants, bundles, tiered or customer-group pricing — as a trade seller I see no net-price or customer-specific price list story at all, which tells me this page has not met a trade customer.
Shopware
The captured developer pages show a real variant model with parent-child inheritance and a configurator, hierarchical categories, multi-sales-channel availability, and a payment system built on extensible synchronous and asynchronous handlers — but customer-specific prices appear only in the top Beyond tier. I found no public information on bundles, tiered pricing, guest checkout, or invoice and direct debit as payment methods, which is the first thing a German trade buyer checks.