Post complete outfits with both jeans and trousers and let the experts decide :)!!!
Also black is almost always versatile and staple in any wardrobe. Light gray is less versatile and requires more careful combinations with everything (shirt, belt, outerwear, shoes and underwear [if you plan on showing them haha!!!]).
I suggest buying black or dark trouser or jeans first and then go with the shades.
Let the experts provide more suggestions!!!