I haven’t seen the product in a couple of years, but your team has always stood out as uniquely knowledgeable and deliberate with your approach. You are getting the data models right in a way that I don’t think others are. For anyone reading — I think these folks are worth a look. We have used many (MANY) of the solutions mentioned here and if Fulfil has been able to get it right - it should be great.
The problem is WooCommerce isn't a product. It's a framework and it depends on your implementation as to whether or not you're going to have a good time with one inventory management system or another.
In direct comparison to Shopify, when you uninstall a Shopify plugin you have zero risk of lingering effects. You can't install a plugin that will break your API in "please hire better developers" ways, and Shopify doesn't give you enough power to harm yourself with "infinite variant" issues or un-trackable products.
Even with WPEngine which takes much of the complexity away of improperly sized machines or databases you still are able to destroy your ability to interface with other software through variant madness or overzealous plugins.
That being said we support it and our customers are happy who use it and get through the initial hurdles but it's very much up to your team or in most cases the outsourced help as to whether or not you're compatible.
For one, we have a 100% open API that's included in our subscription.
if you're interested you can message me directly at [email protected], would love to show you the product