Shopify Plus comes with an extensive and flexible catalogue and supports a huge number of total items. There is no limit on the number of products you can add. There are many stores hosted on Shopify Plus which have 1 million+ products in their catalogue. But the only downside is that there is a 100-variant limit on the individual products. You can’t create more than 100 variants of a single product. Although, 100 variants are very high can’t be a usual problem but it should be kept in mind.
Adobe Commerce also has no limits on the products you can add, and features that allow you to up-sell, cross-sell, and show related products when customers browse the product catalogue and check out.
In addition to this, Adobe Commerce also allows you to create a single, unified product catalogue for each and every store you run.