I'm also new to mining, and I think there are some reasons why people still mining on those big pools:
- Big pools also have better appearance and more well-known as well (even on wiki), and newbies can easily find that how much they can get DAILY
- They wanna get daily payment (even if they're smaller )
I now have 3 S9, 2 of them stick to viabtc or btc.com, and 1 to kano. 2 are for monthly payments, cause I sometimes can't wait for kano to get block & confirm, payment as deadline for invoices come....
Just my thought