In the inventory you will have view per variation with more details like : SKU and edit mode to update your inventory.
In the listing table you will view per listing without the variations , it's more high level view with total inventory amount for the entire listing.
Are you keeping Etsy and and replacing Woocommerce with Shopify ?
OK, let me know if you have any further questions regarding inventory management I would be happy to assist you.
I'm also developed a new app that will automatically sync between your inventory between Shopify and Etsy, making sure you will not oversell.
It's currently free and will help you to manage and view all of your listings and inventory in one place https://apps.shopify.com/shopupz-inventory
Let me know if you are interested to try it.
I thought that I've replied to your question regarding the diff between Inventory and Listing.
Feel free to reach out for more questions and I will be happy to assist regardless to the app , the app it's just a bonus
So you're on here to sell your app. Wow.
WOW! It is amazing isn't it!
In this entrepreneur space when a merchant is seeking solutions to problems some freely give their precious time and experience to help solve merchant pains and at the same time inform others about related solutions for FREE.