I would recommend the 20". It works just fine on smaller cakes, but will also be there for you if and when that occasional larger cake comes along. I am a hobby baker and usually make smaller cakes, but am so happy I got the larger size. i have also never wished i got the double blade. I just cut twice with the single. It is so easy to adjust that it is not a problem. Unless you are using the exact same settings over and over again, in which case the double may a bit of a time saver.
- 474 Posts. Joined 3/2005
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