Catalogue & checkout
OXID eSales
Customer-specific price lists, tiers and discount logic are evidenced, and marketing can build campaign quick filters in the category frontend without a developer — the promotion control I sell on. Five official payment providers including Unzer and Adyen are listed with Unzer described only as flexible payment options, and we found no public information on variant handling, product bundles or guest checkout.
PrestaShop
The 9.2 release ships a native one-page checkout that pulls the whole purchase onto a single page, with developer documentation for adapting modules and themes to it — a checkout I can reshape without a rebuild. But we found no public information on the payment methods German shoppers expect such as invoice and direct debit, nor on variants, bundles, tiered pricing or promotions with rules, so I cannot credit conversion machinery beyond that.