What are the best One Step Checkout and Layered Navigation Extensions ?

[huyenlt]

I've started my business with an online fashion store. I'm seeking for the best provider of One Step Checkout and Layered Navigation Extension. Please recommend me some!
Could you help me comment these two extensions? I find it provides quite enough necessary features that I need.
bsscommerce.com/magento-2-one-step-checkout.html
bsscommerce.com/magento-2-layered-navigation-extension.html