discoveryd vs mDNSResponder

$ ls -l
total 3896
-rwxr-xr-x  1 user  staff  1162672 May 26 19:09 discoveryd
-rwxr-xr-x  1 user  staff   830464 May 26 19:35 mDNSResponder
$ otool -L *
discoveryd:
	/System/Library/PrivateFrameworks/WebFilterDNS.framework/Versions/A/WebFilterDNS (compatibility version 1.0.0, current version 1.0.0)
	/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 1153.18.0)
	/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit (compatibility version 1.0.0, current version 275.0.0)
	/System/Library/PrivateFrameworks/Symptoms.framework/Frameworks/SymptomReporter.framework/SymptomReporter (compatibility version 1.0.0, current version 1.0.0)
	/System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration (compatibility version 1.0.0, current version 699.1.5)
	/System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 1.0.0, current version 57031.30.5)
	/System/Library/PrivateFrameworks/DeviceToDeviceManager.framework/Versions/A/DeviceToDeviceManager (compatibility version 1.0.0, current version 31.0.0)
	/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 120.0.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)
mDNSResponder:
	/System/Library/PrivateFrameworks/WebFilterDNS.framework/Versions/A/WebFilterDNS (compatibility version 1.0.0, current version 1.0.0)
	/System/Library/PrivateFrameworks/DeviceToDeviceManager.framework/Versions/A/DeviceToDeviceManager (compatibility version 1.0.0, current version 31.0.0)
	/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 1153.18.0)
	/System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration (compatibility version 1.0.0, current version 699.30.1)
	/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit (compatibility version 1.0.0, current version 275.0.0)
	/System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 1.0.0, current version 57031.30.9)
	/usr/lib/libxml2.2.dylib (compatibility version 10.0.0, current version 10.9.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1213.0.0)
	/usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 283.0.0)
$ nm * | wc
    1888    4869   76235
r$ nm discoveryd | wc
     384     769   14927
$ nm mDNSResponder | wc
    1500    4098   61279