I have used both (u should use both plus all other platforms to sell your product tbh). I've found magicwebstore.xyz to be the best; simplest & easiest to use. You can learn about them here on SN. Both need better discovery but I prefer magicwebstore.

lightning

Plebeian Market VS Magic Webstore

Kontext

I have used both (u should use both plus all other platforms to sell your product tbh). I've found magicwebstore.xyz to be the best; simplest & easiest to use. You can learn about them here on SN. Both need better discovery but I prefer magicwebstore. 
Can self-host too. 
• https://stacker.news/items/178135
• https://stacker.news/items/177667