Oh, so that's why you came back here
Anyway, on to the question at hand; there are a ton of reasons why players may go to the Hive instead of MCSG.
1. Basically all the big, successful Youtubers play there.
2. There are more gametypes.
3. As stated earlier in this thread, many people believe the Hive community is better.
4. Hive allows BSM.
5. Some people might like HiveSG's features, such as crates and randomized crate locations.
6. The Hive has the official survival games maps and there maps are arguably higher quality.
7. Hive has shown to be more reliable and consistent with server uptimes compared to MCSG.
8. Hive is the most popular server network, and I guess some people like to be with the most popular.
There's probably other reasons but that was all I could think of off the top of my head. For me, Hive is a great server set, but it is slightly more difficult to get into servers, due to their popularity, and the EU lag turns me away. I used to play on the Hive until I got sick of the EU lag and decided to play MCSG until the US Hive came out. Now, I don't see myself going back to the Hive for SG, since I've made so many good friends here at MCSG, but I still occasionally play the other gamemodes they offer.