Can anyone tell me which vendor has the best Extension for Product Feed. I'm currently using Magento 2.2. Thanks in advance.
There are multiple extensions is available for the Product feed for Magento 2 .
Based around my experience among them here i am listing two extension which might be helpful you.
Advanced Product Feeds for Magento 2 - https://mirasvit.com/magento-2-extensions/advanced-product-feeds.html
Product Feed for Magento 2 - https://amasty.com/product-feed-for-magento-2.html
Note : This is based around my experience and my opinion.