I have a server at home accesible via local WIFI. I also have several laptops. I share folders in the server using sshfs due to its ease-of-use. But sometimes I notice lots of connections issues with the shared folders.
Is NFS a better solution?
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I've used SSHFS in a corporate environment in the past and it is, in my experience, unreliable under heavy load and best suited for casual use.
If you need a heavy duty network filesystem go for NFS or CIFS (Samba). You will have to trade encryption for stability, though, unless you use NFSv4, which supports encryption.
So yes, you could use NFSv4 as a replacement which would both provide better performance under heavy load and encryption. This document at ubuntu.com explains how to set it up.