Steemit is a website developed on the Steem blockchain
Peakd is a website for the Hive blockchain

PeakD has dozens of additional features compared to Steemit.
There is nothing steemit has that peakd doesn't have and dozens of things steemit doesn't.

Steemit was developed years prior to peakd and went for years without many if any upgrades. Even now peakd is upgraded frequently and I'm not sure when the last feature upgrade to steemit happened.