Selling photos online through a gallery platform or a separate shop. What makes more money?

Looking for some real world insights ...So i plan on commercialising my print store and im torn between two directions

1. Invest in a dedicated client gallery platform that has a built in store backend(say something like Pic-Time or Pixieset). The automated sales funnels, emails all look interesting but feels tightly tied to client delivery.

2. Setting up an independent standalone shop via Shopify or Squarespace and handle the marketing myself completely.

People who have tried both whered you actually see the best conversion rates? I shoot a mix of event bookings and regional landscape work that I'd love to sell as fine art prints. How do you think this can be achieved without turning into a full time marketing manager?