Gas-powered walk behind concrete saws offer mobility—no need to worry about cords and generators—and are more capable of handling heavy duty tasks than electric versions. Gas can cut dry or wet without the obvious concern for electrical connections. Wet cutting is recommended to prevent dust and some come with a vacuum and  dust containment system. On the counterbalance, gas isn't recommended for use in enclosed spaces that lack ventilation. Gas doesn't fire up as quickly as electrical saw, the saws reach piercing decibel levels, are heavier than electric and require regular filter/spark plug changes. Because gas has fueled most large tools historically, buyers tend to stick with gas vs. alternative power sources.