Fettering Blade is better than Egeking in every way BEFORE you fully augment it. Fully augmented, Egeking gets 30 Magic accuracy. As an offhand, magic accuracy skill doesn't matter so it is more useful for the stats it does provide. Mainhand, Fettering Blade is overall better but it also depends on what you're doing.

Sanctity necklace is better than the Tenzen neck piece only if you're not magic bursting. Magic bursts make the magic accuracy from the sanctity piece not a big deal so you want as much damage as possible, which the Tenzen piece provides.