To me these are somewhat similar because I like liner locks and the compresion lock, and these 3 are similar in size. I just got a used Manix2 so now I can make a comparison.
The Para2 is not as tall, but has a longer handle.
All 3 knives operate very smoothly
The Para2 and Manix2 both feel good in my hand, the Tenacious seems to have a grip that is almost too short, and is not contoured well for grip.
The Manix2 (un skeletonized) is considerably heavier than the others
I would prefer the Manix to be tip down carry
The BBL is not operable with just my thumb, but after some practice I can operate it one-handed with my thumb and first finger.
I'm surprised that the Manix2 blade appears significantly shorter in the photo, on paper it is close to the length of the Para2 blade.
The Para2 is not as tall, but has a longer handle.
All 3 knives operate very smoothly
The Para2 and Manix2 both feel good in my hand, the Tenacious seems to have a grip that is almost too short, and is not contoured well for grip.
The Manix2 (un skeletonized) is considerably heavier than the others
I would prefer the Manix to be tip down carry
The BBL is not operable with just my thumb, but after some practice I can operate it one-handed with my thumb and first finger.
I'm surprised that the Manix2 blade appears significantly shorter in the photo, on paper it is close to the length of the Para2 blade.