if you pick the jigsaw, you can hit blue-eye lucys and pastaves and also lemonblasts. and, of course, more jigsaws. but no super pastel stuff.
if you pick the lemonblast, you can hit super pastel stuff, but no blue-eye lucy or pastaves, no jigsaws.
So i would say jigsaw all the way, mostly because with the jigsaw you in the future will hit lemonblast as well as jigsaw, also pastel jigsaw. With the lemonblast, because you already have pastel, all you gain is that you get to super pastel stuff faster. i think a second nice codom BEL-gene in the form of mojave will just do more for the collection and the clutches than a second pastel gene.
of course pastel jigsaw would be nicebut with normal jigsaw, you can produce one yourself.