In reply to Imedio:
I think this one very much depends on what goals you have in mind. If you're already strong on a crimp but struggle with smaller holds, then a period of specific small edge training makes sense. However if this is a base strength phase at the start of a winter of training then the larger edge makes sense as the strength gains will be similar without the added skin damage or increased risk of injury.
You can also consider changing grip type if you are plateuing (presumably you're currently using half crimp). Training front 3/back 3 half crimp or middle open can be a great way to break a performance plateau and improve grip strength specificity at the same time.
Hope this helps.