Can you see my above picture? The top switch is a reverse clicky. The bottom switch is a forward clicky. The forward clicky has exactly one more part (a spring that keeps the circuit closed after the click) than the reverse clicky...
Oops. Couldn't really see the picture well. So, my speculation about switch design is wrong, but it is still one more part for the forward clicky which in a large production design might have an impact. Or it might not.
I have 2 further thoughts, now that we've warmed the subject:
1) (And you'll have to look at your switch parts to tell me if this is so) I think the reverse clicky button pushes against the pressure of one spring when you're activating it; and when you release the button after turn ON, the full pressure of that spring is holding the contacts together.
When you push on the button of a forward clicky, are you not pushing against the pressure of both springs to actuate it? And when you release the button, aren't the contacts only under pressure of one of those springs, with the other pushing only against the button? If that is the case, then wouldn't a reverse clicky be applying more spring pressure onto its' electrical contacts than a forward clicky
of the same felt spring pressure? More pressure on the contacts could increase reliability. Or is that not the case based on what your parts show (can't see well enough to tell)?
2) More importantly, I'm thinking there might be more of a variation in forward clicky designs than in reverse clickies, and that may be part of why I have my impression. I know that my Kroll switches (on the old Arc LS) were certainly designed differently than what you show and they (in my experience) had horrible reliability - and I did take one of those apart trying to fix them.
I don't know how S*****re clickies were designed, but there were stories about some of them for a while, and they cost an arm and a leg.
I have had both forward and reverse clickies in modern lights since those Kroll's and neither have failed me so far; but as I mentioned above, the forward clickies just don't buy that much convenience for me when they are recessed into the tail. Must be my fat thumbs or something.