I run Geax Saguaro 2.2 front and back in late spring/early summer when things have mostly tried out but have not become crumbly and loose, and swap in a Maxxis Ardent 2.35 in front as things get sandy and dusty in the late summer and continue through the fall when it gets wet and sloppy. Mostly I like the larger, more aggressive tire up front for cornering. It feels to me like the combination of more aggressive tread and lower pressure that a high volume tire allows for make a big difference. The Saguaro 2.2 does fine on climbs, so I never bother to change it. It isn’t really a conscious effort to run bigger tires up front.