I would expect Trump's to be worse since he's almost certainly a worse and more vindictive human being.
Especially if he loses his 2020 reelection bid. In that case, he'll be so miffed that all bets are off. He may well pardon all federal inmates just to watch the country burn.
If he wins in 2020 and can ride off as a winner, maybe he'll "only" pardon the hucksters, extortionists, and petty capitalists that he counts himself among. Will still be grosser, I suspect, than any pardon list in American history.