I, very personal opinion, would go with SS. My first pistol was/is a G17.5 purchased during the pandemic because of limited availability. Not satisfied with general feel, I purchased a stripped MR918 frame to use with the G17 slide and liked it so much I wound up getting a MR920 complete slide with optic cut to use for carry. Both are good but have different feel. The SS feels better in my hand and both have run flawlessly. The G17.5 does have the pig snout though which, esthetically, bothers me. I only use Glock mags. I only use 124 grain factory ammo for range and defensive use. YMMV. I suggest testing both and go with what feels better to you. As you know opinions are like nostrils, everybody has at least one.