2.00B = 333 strap 1:1
2.00D = 400 strap 1:1
Technically you should get better performance from using B, but i'd set both up, run Everest, & compare the two.
Also, as i've said a zillion times, 1:1 is the slowest ratio you can run...
You'd get better performance by loosening up to 5-5-5 & running 2.4B/D, 2.5, or 2.66B
On a funny note about the straps, you'd think the 400 strap would be easier to run than 333, yet when i had my UD3P, i could not POST over 467 MHz with 8 GB using the 400 (2.00D) strap...i had to switch to 333 (2.0B).