Given that, a wider 26", say 4.8", will have a bigger contact patch than any 27.5. So for traction, 26" wins vs 27.5" as you can run bigger contact patches with 26" than what is possible with 27.5. Also, the wider the rim, the lower pressure you can run. Not sure how wide the widest 27.5" rim is, but 26"x100mm wide rims will allow for lower psi
Tubeless Ready Clincher. Tread and Sidewall. TR0083 Surly Dirt Wizard Tire: 27.5+ x 3.0” 60 tpi, Black. 584 / 650b / 27.5". Tubeless Ready Clincher. TR0021 Surly Dirt Wizard Tire: 29+ x 3.0” 60 tpi, Black. 622 / road / 29". Tubeless Ready Clincher. The Surly Dirt Wizard Mountain Bike Tire is highly-focused on providing traction and control
Tyres of the same size may come with lots of different markings: 28×1¼×15/8, 28×1¾×1¼ or 700×32C, for example, which are all 32-622. Even worse, the same or very similar markings can sometimes be found on completely different sizes of tyre: 26×1½ and 26x1.5. It might be supposed that these two tyres are both notionally 26" diameter
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difference between 26 27.5 and 29