Let's see - I have had a custom stock built by Wenig, DeVault, and Kolar. Out of all 3 of my custom stock builds, I cannot say that one was truly the best. Dennis DeVault makes his stock fit you. If you look long enough at pictures of DeVault stocks, you will see the pattern of fitting....where the grip is, how the comb is shaped, etc. Both Wenig and Kolar built a stock to fit my sloppy mount.
One thing to consider when having a custom stock built - the fitter will need feedback. The stock I had built by Wenig was a tad short for me. It wasn't when I mounted the gun or even shot on their range, but as a tendency when shooting competitive score (real good or real bad) I crawl the stock. It is an aggressive problem that I have tried to work on. Instead of telling Wenig my problem and having them build the stock longer, I figured that I would work on my problem since it was my problem. What I found was no matter how much I practiced in the off-season, I crawled the stock the very first 100 I shot in competition. What that did was push my face past the comb towards tang. Then the comb shredded my cheek. Now I had a bigger problem at the very start of a 1000 target event. If I had told Wenig my issue up front, this problem could have possibly been avoided.
If a fitter tells you that their way of fitting is the best, that they can't build a stock to your mount, tries to change your mount or style - Run! You will be better off finding another fitter.