Love my Manix 2 XL. I think it has a few advantages over the para 2.
I personally prefer the caged ball-bearing lock over the compression. I don't find it difficult to manipulate one-handed, and the symmetry is nice. I don't worry about the strength of any half-decent lock though, so it's really not an issue.
You also get the exact same steel, but more of it.
I also prefer the fact that the steel liners go all the way through on the manix, whereas they are set into the G10 on the para 2. I feel this makes the handle sturdier. If you 'flex' the handle of the para 2 you can see that it shifts around a bit and can make the blade look off-centered. I attribute this to the 'excess' G10. (I understand this isn't really a big deal in a practical sense.)
When you compare them end-to-end, the handles are the exact same thickness. I initially expected the para 2 to be narrower, and was a bit disappointed. I think it would be better to have the liners go all the way to the edges of the knife like in the manix and just drill them out (they are solid in the para 2). The manix 2 xl actually uses the edges of the liners to have some additional gimping, which I think is nice, although I can understand why some people think it's uncomfortable.
On the other hand, the blade shape and ergos of the para 2 are very nice, and the compression lock definitely appeals to me for one-handed ease of use, same as the CBBL.
Basically I just feel like you're paying more for less with the para 2. It uses less steel and is probably easier to machine all the parts for, most of which are extremely similar to those in the manix.