I have that S&B with H59 and LOVE IT. You won't find better glass, IMHO.
If you are right handed, I'd go CCW. I use my right hand (trigger hand) to adjust elevation. With a CCW turret, you adjust and your hand is out of the way when you're looking at the numbers on the turret. If you had a CW turret, you'd end up seeing your thumb covering the turret numbers. This is my experience anyhow.
However, if you're using a H59, you probably won't touch the turrets much. Doing holds with that thing is a piece of cake.
My one complaint about that MTC locking turret is it's hard to hit 3.1 or 3.2 mils. Anything with .1 or .2 is hard because of the hard detent. I usually bump right past the .1 or .2 and land on .5 when I'm in a hurry. If you dial a lot, I'd give this serious consideration. S&B can defeat this hard detent for you to make it like the older DT knobs for a small fee. I think it's like $50-70 bucks. It's pretty cheap when you're talking about dropping damn near $4k on glass.
The FOV in that 3-20 is amazing. I'm personally not sure the 3x is very useful with the H59. If I had it to do again, I'd probably go with a 5-25. The 3-20 is a badass scope tho.
Hope this helps.