Looking at one of the bikes, I'd guess cross country (XC) mountain biking (M). OP is from Spain, so maybe goes by diff. abbreviation than U.S. I cannot read the language of some of the links, so if OP sees I replied, I can't really pick one. Also, once you get to higher end bikes, most will meet our capabilities and needs. At some point it comes down to fit, feel, and maybe dealer support.