You can't really compare Ethereum and Digibyte. Both solves different applications.
Ethereum more on Dapps (The web, virtual worlds, managing identity, help developing businesses, micro-blogging, art, crowdfunding and many more. Unlimited possibilities)
Digibyte more on security but also have a sub-set industry which is gaming. They have supported the largest games such as Lol, CSGO, WoW and soon Minecraft into their system.
I invested in both but more on Eth, very little on Digibyte. I tried Digibyte wallet and it's really buggy and not ready.
As you can see, Ethereum is a very large complex and big project. Nevertheless, both have really bright future and also do your own research.
Thanks!!