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Here's my two cents. Grooves, swirls, nubs, ridges....... all can help, but in my opinion not enough to warrant spending a premium on a bowl for said "enhancements". I've used all types of bowls and scuttles and the only thing that I think truly helps is having a textured surface. And it doesn't have to be much, just something to give the brush some resistance. I started with a smooth surface soup bowl. Then I transitioned to a plastic salsa bowl. It has a somewhat textured surface and I could definitely feel a difference and see an improvement in how my lather came together. After that I tried some of the more expensive options, and while some felt really good in my hand or looked really good on my counter or in my SOTD photos, they really didn't offer a better lather experience.
The main thing I like about salsa bowls, is they are light-weight and near indestructable. They dont care if you drop them, unlike most of the bowls and scuttles out there. They are cheap, only a couple bucks, and come in a variety of colors.
Now, if you want a nice ceramic bowl, I'm not going to disuade you from getting one. I still have a few, and I do like them, but they aren't what I use primarily when reaching for a lather bowl.
Also, if you are looking for a lather bowl to take on travel...... get a collapsable doggie water dish. I bought 3 off amazon for a total of under $6. THey work great and collapse to fit anywhere. Just enough of a textured surface to get the job done. And it's the exact same as the Stirling Travel bowl, without the nubs in the bottom, and at a fraction of the cost.