Same reason as to why people pick lol over dota and vice versa.
It's just the same idea, but made differently, just try it yourself and see if you like it, that's the only way you'll find out.
What is so good about smite compared to League of legends and Dota 2? Please someone tell me this.
I like it more because it has a different point of view, its easy to pick up and difficult to master. I also find it more relaxing to play than Dota and HoN. I feel its much more about tower pushing and solo play in Smite, but that might just be my playstyle. You can't really say its better than LoL, HoN or Dota but its pretty different.