Honestly, they're all amazing. Both responses you've received are good; the Gneis EBB is great for its level. The O Pro II EBB is L89 I think, but it's fantastic. And for the in-between, the Bismarck EBB is also excellent. You really can't go wrong with any of them.
Check General Discussion for a post by Rehor called "EBB Release" for a link to a table describing general attributes for each EBB.