First of all, I think a good quality bread is essential.
For egg, tuna and chicken salad, I like a thick cut, grainy bread or a croissant.
For luncheon meat and cheese sannies, I prefer a thinner, lighter bread since I like to use additional toppings like lettuce, tomato, onion and bread and butter pickles.
When I pack a sandwich for work, all sog inducing toppings get packed in their own happy little container until they need used.
Once in a while I love a good old balogna sandwich slapped on white bread with mustard, lettuce and potato chips on the inside- then flattened down. MMmmmmm lol
BLT's must be on toasted bread, and I love spreading a little ranch dressing on the toast before adding the B L and T.
Triangle cut here, pointy side in the gob first!