What I would do? Well, if they would offer Frostbite 3 for free with not more than 5% royalty and they would offer source code and they would offer direct fast support and they would have a real nice community and they would have constant updates and a nice marketplace and they would offer grants and they would make hundreds of great tutorials and they would have a real nice documentation and of course a nice visual scripting language at least as great as blueprint, well, then I would download frostbite 3 and try it out.
The “stuff around” is at least as or even more important than the engine itself. That’s why UE4 is unbeatable.