Regarding the "defensive position" drawbacks of a ported
barrel.
This is a revolver, dang it, and the cylinder-to-bore-gap flash, bang, and fire is gonna get you in that scenario much more than the ports.
As far as "blast-back", my two-inch Taurus .44 doesn't seem to know it's supposed to do that or shave lead. Sure does help to tame the recoil, though.
Likewise, "port flash"; again the c/b flash overrides any additional flash from the ports (upward facing, in my case.) I cannot notice them when shooting, even in low light, but can see them if someone else is shooting my gun with me only observing.
I'd go with the ports, within my experience.
ElZorro