Is it worth running ads to my Redbubble Page or should I run them to my Shopify/ printful store

Hi guys

Since the margins for Redbubble are not great do you think the best way would be directing my Facebook ads to my shopify store? It’s a brand new business so I’m thinking the advantage with directing my ads to Redbubble give customers a trusty website to buy from but then again the margins won’t be as good.

What will be the best way to do it?