I myself say I want bob adjustable holds, but that's not a completely accurate statement.
What I really want is removable holds. I do a lot of riding where I would benefit from a wider tray and do not need holds. The bob holds can be removed, and the bracket is screwed on so I don't have to worry about losing it.
If I just wanted to do freeride, then I would go with regular holds. To me, adjustable really just means heavier and / or weaker. I just don't see a huge advantage.
Like the b-pipe. Lots of people don't adjust them, and I'm sure if there was a non-adjustable version that just had one properly sized hole for $50-100 cheaper, it would out sell the one we are used to. It's what I would buy.