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Price, reliability, simplicity, build size, resolution - in that order.
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price, less maintenance, customer service, generic filament / multi filament, good build size.
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Self-leveling or correcting bed. Ability to add multiple extruders. Reliability.
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Zero or almost zero maintenance necessary
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Build volume, speed, cooling, heated chamber or build plate, level of backlash, Z-axis resolution, quality of construction, high-temp hotend(s), software interface, and UI on the printer itself... I'm pretty picky :D
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Price range unfortuately....
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affordability, accessibility, a large print area (heated), chance to print in multible materials at once, speed.
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I would look at the price first then build volume and quality of the print.
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Build volume, quality, and speed.
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upgrade-ability, company reputation and support, a community to help with problems.