When comparing OTTTD vs Radiant Defense, the Slant community recommends OTTTD for most people. In the question“What are the best tower defense games on Android?” OTTTD is ranked 9th while Radiant Defense is ranked 12th. The most important reason people chose OTTTD is:
At its core OTTTD is a tower defense game but it has an added mechanic of "heroes". Heroes allow for the layer to use them in ways on maps like one would in an RTS, placing then=m in specific tactical areas to utilize their special skills such as sniping or being a mechanic that fixes towers.
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Pros
Pro Interesting mix of tower defense and real time strategy mechanics
At its core OTTTD is a tower defense game but it has an added mechanic of "heroes". Heroes allow for the layer to use them in ways on maps like one would in an RTS, placing then=m in specific tactical areas to utilize their special skills such as sniping or being a mechanic that fixes towers.
Pro Cloud save and achievements via Google Play Games
It supports Google Play Games features, such as cloud saving and achievements.
Pro Challenging but fun
Pro Well balanced
Pro Great Neon visuals
Cons
Con Paid upfront and includes in app purchases
OTTTD is a paid upfront game and yet it also includes in app purchases that go as high as $46.90.
Con Not recommended for phones
With so much happening on screen OTTTD is not recommended for phones and their small screens.
Con Practically no descriptions of aliens' strengths or weaknesses.
Sometimes, you have to guess.