Magento vs 4imprint vs Vistaprint vs SwagUp for B2B promo + merch, when does each win?

Honest cut, promo-industry-specific:

• 4imprint, AnyPromo, Discount Mugs, Quality Logo Products, you sell through them as a reseller / affiliate or use them as a sourcing supplier. They’re not platforms you build on. Use them if you don’t want to own the storefront.
• Vistaprint, consumer-friendly DIY merch (business cards, t-shirts, mugs). Single-product, single-design. No catalog scale, no B2B layer, no corporate accounts. Use it for “I need 50 t-shirts for my conference” one-off jobs.
• SwagUp, Printfection, Brandable.com, Reach, managed B2B swag platforms with employee-gift portals. They handle the supply chain. Use them if you want zero ops and don’t care about owning catalog data.
• Magento + Hyvä, own the storefront, own the data, own the catalog. Run a 50k+ branded-SKU 4imprint-competitor, run a corporate-only HR-portal for Fortune 500 employee gifts, run a single-product specialty merch brand. Tier-priced quantity breaks, MOQ + lead-time at PDP, decoration configurator with live mockup, ASI + PromoStandards EDI feeds.

Most promo brands at $1M+ GMV who want to scale beyond a SwagUp-style hosted stack land on Magento because the decoration configurator + ASI feed + B2B corporate-account combo isn’t something Shopify or BigCommerce handle cleanly at 10k+ SKU scale.