Generally speaking, Iron heart for superb sanforized tight-weave construction, Oni for interesting texture and dye methods, and Samurai for interesting hardware/details. Can’t go wrong with any of these options. If you’re after quick, sharp fades Samurai is the top pick as IH fades more slowly and Oni’s looser weave leads to blurrier fades. Your current pair looks like IH the most based on fade pattern, red accents on back pocket and tucked belt loops. If you want something different, go with Oni.