Short answer
Foil shavers cut with oscillating blades behind a thin perforated foil and use straight strokes; they give the closest finish and suit straight-growing beards and daily shaves. Rotary shavers use spinning blades under round heads and small circles; they follow contours, handle swirly neck growth and are often kinder to sensitive skin.
How a foil shaver works
A thin, perforated metal foil sits over blades that move side to side very fast. Hair pokes through the holes and gets snipped. Because the foil is so thin, the cut lands very close to the skin, which is why foils usually win on closeness.
Better foils add trimmer elements between the foils to catch longer hairs, and floating heads that tilt with your jaw. That combination is what lets a Braun Series 9 Pro+ clear a week of growth.
Use straight strokes, against the grain on the second pass, with light pressure.
How a rotary shaver works
Three round heads each hold a blade that spins behind slotted guards. Because the blades turn in circles, they catch hair growing in any direction, and the heads flex to follow curves.
That makes rotaries good on the neck and under the jaw, and the spread-out pressure is often kinder to sensitive skin. Philips rates its self-sharpening heads for about two years.
Use small circles with light pressure. Pushing harder does not cut closer.
Foil vs rotary side by side
| What matters | Foil | Rotary |
|---|---|---|
| Closeness | Closest | Very close |
| Sensitive skin | Good | Usually better |
| Neck and swirls | OK | Better |
| Long stubble | Premium foils best | Flagships good |
| Edges and sideburns | Easier | Use trimmer |
| Head life | 12-18 months | About 2 years |
| Head shaving | Works, slower | Multi-head rotaries |
Who should pick which
Pick a foil if
- Your beard grows mostly downward
- You want the closest finish
- You shave daily or let it go a few days
- You keep sharp sideburn lines
Pick a rotary if
- Your neck hair grows in swirls
- Foils have given you razor burn
- You want long blade life
- Your jaw is very curved
Technique for each
Foil: stretch the skin lightly, hold the head flat, use slow straight strokes. One pass with the grain, one against.
Rotary: small overlapping circles, no pressing. Go a bit slower on the neck.
Both: shave before washing your face (dry skin glides better), or use gel for a wet shave. Give any new shaver three weeks.
Best foil and best rotary shavers
Best foil shavers
- Braun Series 9 Pro+ (9517s): best overall. Check price
- Panasonic Arc5 (ES-LV67): closest shave on thick beards. Check price
- Braun Series 8 (8567cc): best compact premium foil. Check price
- Braun Series 7 (7120s): best flex head foil. Check price
Best rotary shavers
- Philips Norelco i9000 Prestige Ultra: best rotary, most comfortable. Check price
- Philips Norelco Shaver 7800: best for sensitive skin. Check price
- Philips Norelco Shaver 5400: best mid-range rotary. Check price
- Philips Norelco Shaver 3600: best budget rotary. Check price
FAQ
Is foil or rotary better?
Foil for the closest finish on straight-growing hair; rotary for comfort, contours and swirly neck growth.
Foil vs rotary for sensitive skin?
Rotary is usually gentler. Premium floating foils like the Braun Series 9 Pro+ come close.
Foil vs rotary for a thick beard?
Premium foils with trimmer elements handle thick and longer stubble best; flagship rotaries are close behind.
Which is better for the neck?
Rotary, because the heads catch hair growing in any direction.
Can I switch from rotary to foil?
Yes. Change your motion from circles to straight strokes and give it three weeks.