Does a synthetic knot actually shave differently to badger, or is it only how it feels on the face?

Genuine question rather than a stirring one. I've used a badger for two years and borrowed a synthetic on holiday last month. The synthetic built lather faster, dried out in an evening, and honestly the shave afterwards was fine.

So is there anything a badger does for the actual shave that a synthetic doesn't, or is the difference entirely in the feel and the drying time? Every discussion I find turns into people defending whichever one they own, which is not helpful.

My honest position after owning both: the lather on your face at the end is the same lather. The route there differs.

Badger holds noticeably more water, so it's more forgiving with a hard soap that needs coaxing, and it feels softer on the face. Synthetic is faster, dries overnight, and takes hard water and travel far better. Neither of those changes the shave.

What does change the shave is whether your lather is any good, and that's you, not the knot.

Slightly disagree with Graham on one point. Backbone changes how you can work a soap, and that ends up in the lather.

A soft floppy badger paints beautifully but can't dig into a hard triple-milled puck properly. My stiffer knots load those soaps in half the time. So yes, same finished lather in theory, but if the knot makes loading a chore you'll under-load, and under-loading is the number one cause of lather that vanishes mid-shave. Indirect, but real.

Doesn't make either type better. Match the knot to what you lather from.

I've got one of each in rotation and I'd put it like this: the knot changes the experience and the maintenance, and the lather changes the shave.

Where I think synthetics genuinely win is drying. Mine is dry by morning, which matters if you shave daily, travel, or keep the brush in a damp bathroom with no airflow. Badger and boar need proper drying time and a bristles-down stand, and a badger that never fully dries starts to smell. That's a practical difference people underrate because it isn't glamorous.

Where badger wins for me is water retention on a stubborn hard soap and the feel on the face on a day when my neck has had enough. Whether that's worth anything to you is a taste question, not a technique one.

What I'd tell anyone starting: get whichever, learn to load properly, and don't buy a second brush hoping it will fix a lather problem. It won't. How to build a lather covers the loading and water side, which is where the actual variable lives.

Also, the animal-free question is a perfectly good reason to choose synthetic on its own and doesn't need a performance justification.

As a beginner I'd add that the synthetic being unforgiving of too much water caught me out. It doesn't hold as much, so when I flick water in like I did with my first brush the lather goes thin much faster. Had to learn a slightly different water rhythm.

Took about a week. Not a criticism, just something nobody mentioned to me.

Useful, thanks. So the summary I'm taking is: same shave, different handling, and the real differences are drying time, water retention and backbone rather than anything that reaches the blade.

Which means my badger stays home and a synthetic goes in the travel case, and I stop reading threads where people argue about it as though it were a performance question. Rob's point about backbone affecting loading is the one bit I hadn't considered and it explains why my badger has always been slow on one particular soap.