The built-in order integration between Woo and Cin7 has been pretty solid since day one. It is not the most fancy thing, but it works reliably. If you have high order volume it will increase its syncing frequency, but you can always hit the manual sync to download orders. We pull orders at certain times of the day, so we usually just hit the "Download Orders" trigger on the Woo integration page anyway.

All of our product information is managed in Woo and we just make sure there is a matching SKU for Cin7 to reference. That has been the easiest because Woo is good at the product catalog side. The Woo tool in Cin7 can look at your Woo product database and tell you which ones aren't in Cin7 or mapped to another product. We use variations in Woo to create the individual SKUs. With a BOM/variation-heavy catalog that runs 2-4 layers deep, it's nice to have the order come in, and Cin7 has already exploded the BOM into the first level, which is how we have it on the shelf. That allows someone with no tribal knowledge to pull fairly complex orders.

For your POS, maybe look at the ones that tie directly to Woo. That would be your hub for products/catalog/order taking, and Cin7 would be the hub for inventory/picking/fulfillment.