I really loved the feel of the Pixel 2XL last year, and this year I really really love the feel of this year's Pixel 3XL, but my phones tend to slide off the arm of my recliner/rocker/swivel chair or sometimes how I sit they fall out of my pocket in between cushions against the metal leavers or hit the concrete floor. I would love to use my phones naked, but I worry about chips, cracks, and gouges in them.
I bought these for my Clearly White Google Pixel 3XL, and I am very satisfied with these cases:
OtterBox Symmetry Series Case - Gradient Energy (I love the glitter, it has a Teal to Pink to Purple transparent back) This is a very nice case not slick like other OtterBox phone cases. The clear material seems more grippy than their other plastic cases.
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Places My Case - White (Protective is the only one available when purchased, 2XL also had Slim case) This is a very thin case and has a nice feel to it, not slippery.
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I love the Google Pixel 3 Case that is covered in fabric, but I had the 2XL fabric case and to me it was too slippery to hold the big 2XL phone. I am sure it was a perfect grip on the Pixel 2, just not for the 2XL.
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On larger phones I have trouble with a lot of case materials being too slippery or slick to hold without them sliding out of my hands or not having a comfortable grip. I do not have a grip problem with smaller phones using the exact same case materials.