NS10's are the industry standard....they are flat....mixes done with these translate well because they are very unforgiving......the slightest of mixing errors will jump out on these.....they are the most widely used monitor in the biggie studios.....only drawback is they can be a tad on the fatiguing side......
Myself, I rather the Tannoy Proto-Js...somewhat similar to the Yorkvilles....Like the Yorkville's, maybe not as extremely accurate as the NS-10's but pretty darn good....alot easier on the ears.....
so, if i were mixing a pro record, NS-10's....for home studio use, the YSM-1's....