The Lyman is a really fine instrument, looks great and is accurate and rugged. The Williams does not look as good, but it's also accutrate, rugged , simple and a lot cheaper.
Either works just fine, Lyman costs more and looks more complicated.
Depends what you want.
I have used the Williams Foolproof sights for over 30 years with no problems.
You may have to go to a taller front sight blade in either case.
Mark
BTW, the .35/336 is an excellent rifle.