So I am wondering which chain is more active...

Did a similar experiment by posting a copy of the same post to STEEM, HIVE and Smoke. Here are the respective results...

STEEM - 119 VOTES - 11 COMMENTS - $0.63 REWARDS
HIVE - 46 VOTES - 5 COMMENTS - $1.06 REWARDS
SMOKE - 5 VOTES - 7 COMMENTS - $76.19 REWARDS

As they have not paid out yet here are the respective links....

https://steemit.com/hash/@novacadian/time-well-waisted-the-prequel-it-s-not-easy-being-a-freak

https://hive.blog/morocco/@novacadian/time-well-waisted-the-prequel-it-s-not-easy-being-a-freak

https://smoke.io/smoking/@novacadian/time-well-waisted-the-prequel-it-s-not-easy-being-a-freak