Zacharoo,
No one can tell you what will work best for your eyes. I prefer an undercut black patridge front sight blade, .125" wide, and of a height suitable to allow zeroing with the rear sight 1 or 2 clicks from the bottom.
For a colored front blade, I prefer a square topped (Hi-ViZ) green fiber optic blade.
A good optometrist can work with you and help you end up with a set of bifocals or progressive lenses that will aid you greatly in being able to see your sights and target.