When comparing Miro f.k.a. RealTime Board vs Scapple, the Slant community recommends Scapple for most people. In the question“What are the best mind mapping tools?” Scapple is ranked 11th while Miro f.k.a. RealTime Board is ranked 28th. The most important reason people chose Scapple is:
You can customize your styles, background and font as you wish.
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Pros
Pro Multimedia-ready
You can embed a few different types of media like videos, links, etc.
Pro Customizable
You can customize your styles, background and font as you wish.
Pro Flexible
It gives you the freedom to use visual thinking without the hierarchical rigidity of a mind map.
Cons
Con Can be pricy
It's meant for larger companies and enterprise organizations.
Con It looks abandoned
Despite being a great software as it is, theres no update for more than a year : either to fix minor bugs, or implement new functions.