Insulated stainless holds temperature for hours but is not for the microwave; crystal and lead-free glass show a drink properly but want hand washing; Tritan and acrylic survive a patio.
Two figures decide most purchases: capacity in ounces and whether the item is dishwasher safe. Check the rim diameter too if you plan to add ice or a lid, and confirm the base fits your car holder or cabinet shelf before ordering a set.