20" wheels are said to be very, very robust, all else being equal, and I've found that seems to be true.
They are also said to get up to speed faster or with less effort than bigger wheels.
Currently riding a 20/26 and previously a 20/20.
You could avoid little wheels, RG, by going with a big/big 'bent.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer