Tool comparison
Reciprocating saw or jigsaw?
A reciprocating saw and a jigsaw both move a narrow blade back and forth, but that shared motion can obscure very different jobs. A jigsaw holds the blade in a base shoe designed to guide shape-oriented work. A reciprocating saw is typically used for rough cuts where reach, material removal and access can matter more than a furniture-quality edge.
Look at the blade path and support
For a jigsaw cut, the tool's base rides on the face of the material and helps steer the path. It is generally the more natural option for cutouts and controlled curves in sheet material, provided the base can sit flat and the blade is appropriate. For demolition or repair, a reciprocating saw's longer blade and narrow nose can reach through openings or cut material that cannot conveniently be brought to a bench. Its flexibility may also make the cut less square or smooth. Neither tool replaces proper workpiece support.
Do not choose by “curves” alone
A reciprocating saw can make rough contour, plunge or flush cuts when the exact tool and blade allow them. That does not make it a precision jigsaw. A reciprocating saw's shoe, blade length, tooth direction, access and hidden hazards need to be planned for the particular cut. A jigsaw may be unsuitable if its base cannot rest securely or if the workpiece is fixed in place behind a wall or pipe. A circular or oscillating tool may be the safer or cleaner solution for other geometries.
Ask what the cut must look like
If the edge will be visible or needs a repeatable shape, ask whether the work can be removed, clamped and cut with a supported base. If the task is to sever a pipe, remove a stud or make a rough opening, ask whether the chosen reciprocating saw and blade can reach the line without contacting wiring, plumbing or gas. The name of a tool family is not permission to cut into a concealed space.
Pick the tool that has the right motion, blade, stable support and verified clearance for the material. Follow its current manual, use appropriate personal protective equipment and get qualified help where hidden services or structural elements are involved.