Q on Potential Stats

I'm a little confused about %wa and %total dmg. Let's say out of these 4 stats:
1. +%wa
2. +%total dmg
3. + %boss dmg
4. + wa

for example, for a NL, what would be the order of most desired? would it be #3(most wanted),2,1,4? Still a bit confused on how %wa and %total dmg work.

Thanks in advance!