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Choose a fastening tool around compatible batteries, complete kit cost and the level of work you need it to handle.
The advertised maximum torque is a capability figure measured by the maker. It is not a reliable way to set fastener tension or compare unlike test methods. Use a suitable torque wrench where an assembly requires a specified final torque, and use impact-rated bits compatible with the tool holder.
Repeated long screws can benefit from an impact mechanism, but delicate hardware needs speed control and care. Compare trigger control and available modes before buying. Existing compatible batteries can change the best-value choice; an apparently inexpensive bare tool may cost more once the charger and packs are added.
No. Drivers commonly use a hex bit holder; wrenches typically use a square drive for sockets. Match the tool to the fastener, fitting and intended work rather than the word impact.