Almost every "best breast pump" list jumps straight into brand names. Start here instead: there are three real categories, and picking the right category matters more than picking the "best" pump within one you don't need.
Hand- or lever-operated, with no motor or power source. The most portable and least expensive category, and genuinely useful as a travel backup or for parents who pump only occasionally. The tradeoff is effort: each session takes active hand/arm work, and most parents who pump regularly (multiple times a day, especially for a return to work) find that effort adds up fast compared to an electric pump. Older bulb/"bicycle-horn" style manual pumps are largely out of the market for a real reason: their rubber bulb is hard to clean thoroughly; current cylinder/lever-style manual pumps don't have that specific problem.
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Motor-driven suction through tubing to a flange over the breast, almost always sold as a double (both sides at once) pump for personal use. This is the category most insurance plans cover as their default option, often at $0 out-of-pocket cost under the ACA's preventive-care mandate (see how insurance coverage works), and it generally offers the best suction power and collection speed per dollar spent. The tradeoff is portability and discretion: you're tethered to tubing and (usually) an outlet or a battery pack, and you'll want a hands-free pumping bra if you want your hands free during a session.
Within this category, a genuinely useful product-fit distinction isclosed vs. open collection system: a closed system has a diaphragm barrier between the milk pathway and the tubing/motor, so milk can't reach the tubing; an open system doesn't have that barrier, so the tubing needs more careful cleaning and drying (to avoid mold) than a closed system does. This is a maintenance/fit distinction, not a claim about one system being safer for your milk. Always follow your specific pump's cleaning instructions, and budget for replacement valves every 30 to 90 days of regular use, a maintenance cost separate from the pump itself (seeaccessories).
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The motor and collection container sit inside or directly against the bra, with no external tubing at all. Genuinely hands-free without needing an add-on hands-free bra, and quieter and more discreet than a plug-in pump, the tradeoffs that matter most to parents pumping at work or around other people. The tradeoff: usually meaningfully more expensive than a standard electric pump (a wearable upgrade is rarely available at $0 additional cost), and historically a lower suction ceiling and smaller per-session collection capacity than a plug-in double pump. See thefull wearable-vs-traditional comparison for the detailed tradeoffs before you decide which category is worth the extra cost for your situation.