I've only used 3rd base extended when forced there by catcher movement or positioning. You can get a better look at a swipe tag, but you usually don't see many of swipe tags in the 15-yr old and below range. When using 3B ext., you can be blocked from a tag on a runner sliding straight in from 3rd, which is much more common. 1B extended feels much more comfortable for me. Just my opinion.
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