A good community is very important for an indie game. We want to achieve that using modding. But UE4 would make modding very complicated, seeing that the modder must buy a subscription if he wants to make a mod. Or we have to make some sort of modding tool, which also isn’t easy. But UDK will allow modders to just download the Engine and make a mod. Okay, maybe not that simple. But simpler than UE4. UDK also is free.
Which brings me up to another question: Will UDK be always updated, so even when we use it we can provide the best user experience? Or if we want all the amazing looks we need to have UE4?