Did a quick test of which here are the results..
Tried to keep everything as fair as possible, same number of coats/amount of paint/direction/speed/drying/postion of camera n lighting. Taking the pics was nigh on impossible to keep constant/fair especially with the nature of the reflectivity of the chrome and the outside light/clouds, angles/bend of the transparency stips they were sprayed. The transparency strips themselves didnt lend to very good testing for any of the paints but i didnt have any decent scraps of lexan. Had a few old wings etc lying about but they were a bit scuffed up.
Overall, there isn't a great deal in it and you wouldn't be dissapointed with any of them. For doing small areas like pinstripes etc there would be even less in it. If you were to do a whole large area then it might be abit more favourable one way or the other.
If i had to put an honest placing of them it would be Spazstix, RCS Chrome then the Alclad.
It is very close between the spaz n rcs in regards to clarity, I think the spaz stix is a tad brighter.
Like said though, All are great products and wont dissapoint.
There you have it, tried to be as honest and fair as poss.
