As HHD I predominantly get exactly the same upgrades as I did as an HHG only a few years ago, mostly upgrades under both to Deluxe rooms where hotels are smaller and have no lounge , and to exec where larger hotel with a lounge

Typically Deluxe rooms are as Guest but include robe&slippers, exec is same as deluxe but includes Lounge. Sometimes higher types are a few metres bigger but not that much

Only hotels consistently giving me more are
a)Hilton Antwerp who gave me more as a regular staying HHG guest anyway eg J-Suite AND my first HHD stay I got the top Royal Sinjoor Duplex Suite although hotel checkin paperwork had me down as lowly HHG STILL
b)Hilton den Haag who give HHGs Execs and HHDs Junior Suite
c)Hilton Wembley who give me full suites 8/10 stays
d)Hilton Rotterdam consistently give HHD j-Suite or Full suite
e)Hilton Amsterdam try to give HHDs a J-Suite

I just see HHD as having two benefits OVER HHD
I)guaranteed lounge
II)50% bonus plus 1K Myway bonus

I don't expect better than exec