You've never heard of ARP? Seriously? The Address Resolution Protocol.

What makes it better? If an application is capable of sending exactly the same packets across the wire as another, then nothing makes one better than the other beyond ease of use or the underlying feature set.

Perhaps the ideology is dead these days, but the unix way was to have each tool do one thing only, and do that thing well.

arp-scan fits that particular philosophy I think.

Is scapy easier than the following?:
arp-scan --interface=wlan0 192.168.4.0/24