Great question!
THE Gaia GPS that I use to get out on the singletrack. Lol. It changed everything for me. Oh and um, I love the suspension on the front of my hardtail but… Gaia, gets me to the places that are hidden away and untouched by the masses. I guess any GPS mapping is okay, but I like what Gaia has done for my experience on my MTB. Access to all the trails is the game changer for me. It is truly endless.