Festool 574553 HL 850 E Planer
This is the only handheld planer I’ve seen that has a spiral cutterhead, something I’ve seen on some jointers which do, but no other planers. That alone is enough to make this tool take the number one slot. There are various heads available, allowing you to create rustic architectural effects in beams and flooring.
Even though the speed is only 10,000 RPM, with the spiral cutterhead, this planer will still provide the smoothest finish on this list. Oh, and the blades are self-aligning, so it’s easy to change them out, without having to adjust them every time.
This planer is also designed so the blade is flush with the edge of the tool, so you can plane right up to the edge of a connecting piece (think planning a floor right up to the wall, although you’d never use it for that). This design feature also provides unlimited rabbeting depth. The planning depth is precisely set with a rotary handle, providing from 1/256 (1/10mm) of cut up to 9/64 (3.5mm) of cut. As with all Festool’s products, it’s designed to work with their dust collection systems.