I get the H17 is much better...
From CVCX for Heads-up, HiLo Full Indexes, DD, DAS:
S17, deal 1.21/2 decks, spread 1:6, SCORE 48.08
H17, deal 1.40/2 decks, spread 1:8, SCORE 73.28
Thus, the H17 game is much better, partly due to the wider spread. If we limit the H17 game to a 1:6 spread also, then the SCORE falls to 58.70: still better than the S17 game, due to the better penetration.
Hope this helps!