So as asked for this is equity of both drawing
here we have villain patting 8 on 2nd draw and a J on the 3rd draw (J is a big fav against a 1CD with one draw left)
2-7 triple draw sim, 100000 trials, 3 draws:
Dead cards: 9:diamond:
Hand 0:

--: 2nd draw: stand pat on 9, keep 3489, str8s to break hi: none, 3rd draw: stand pat on J, keep 3489TJ, str8s to break hi: none
Hand 1:

--: 2nd draw: stand pat on 8, keep 568, str8s to break hi: none, 3rd draw: stand pat on 9, keep 5689, str8s to break hi: none
Hand 0: 7:spade: 6:heart: 5:diamond: 2:heart: --: EV
42.1% - WIN/LOSE/TIE %: 42.1/57.9/0.0
Hand 1: 2:diamond: 3:club: 4:diamond: 7:club: --: EV
57.9% - WIN/LOSE/TIE %: 57.9/42.1/0.0
Compare to PAT with villain drawing to 8 on 2nd draw and Patting 9 on river
2-7 triple draw sim, 100000 trials, 3 draws:
Dead cards: none
Hand 0:

: standing pat
Hand 1:

--: 2nd draw: stand pat on 8, keep 568, str8s to break hi: none, 3rd draw: stand pat on 9, keep 5689, str8s to break hi: none
Hand 0: 9:diamond: 7:spade: 6:heart: 5:diamond: 2:heart:: EV
36.3% - WIN/LOSE/TIE %: 36.3/63.7/0.0
Hand 1: 2:diamond: 3:club: 4:diamond: 7:club: --: EV
63.7% - WIN/LOSE/TIE %: 63.7/36.3/0.0
Smooth 8 draw versus villains smooth 7 draw Assumes villain will PAT J on 3rd draw and so will Hero
2-7 triple draw sim, 100000 trials, 3 draws:
Dead cards: none
Hand 0:

--: 2nd draw: stand pat on 8, keep 567, str8s to break hi: none, 3rd draw: stand pat on J, keep 5679TJ, str8s to break hi: none
Hand 1:

--: 2nd draw: stand pat on 8, keep 568, str8s to break hi: none, 3rd draw: stand pat on J, keep 5689TJ, str8s to break hi: none
Hand 0: 8:diamond: 4:club: 3:spade: 2:heart: --: EV
41.6% - WIN/LOSE/TIE %: 40.5/57.4/2.1
Hand 1: 2:diamond: 3:club: 4:diamond: 7:club: --: EV
58.4% - WIN/LOSE/TIE %: 57.4/40.5/2.1
The main thing by the way that I prob mentioned like 10 times now is the added advantage of being IP here, as when villain draws on the 3rd draw we can play perfectly and PAT J or better, raise maybe make him break a J/T or freeze if we have better.
Versus Villain draw to smooth 8 if we PAT 9
2-7 triple draw sim, 100000 trials, 3 draws:
Dead cards: none
Hand 0:

: standing pat
Hand 1:

--: 2nd draw: stand pat on 8, keep 567, str8s to break hi: none, 3rd draw: stand pat on 8, keep 567, str8s to break hi: none
Hand 0: 9:diamond: 7:spade: 4:club: 3:spade: 2:heart:: EV
40.0% - WIN/LOSE/TIE %: 40.0/60.0/0.0
Hand 1: 8:diamond: 4:heart: 3:heart: 2:spade: --: EV
60.0% - WIN/LOSE/TIE %: 60.0/40.0/0.0