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I have owned/shot a number of ported/comp'd handguns - mostly magnums.
IMO the most effective for recoil reduction is this kind:
View attachment 324137
For muzzle rise, I prefer the "hybrid" comp which is a series of holes in the top of the barrel:
View attachment 324138
I once had two G21s, one with this kind of comp and one without. Everybody who shot both could immediately tell the difference in muzzle rise. That said, everybody on the range could also immediately know which gun I was shooting by the significant increase in sound. This was back when Glocks were mostly 9mm and some would come over asking what cartridge I was shooting - think this was some new magnum Glock.
In general, my take on porting and comps is that the larger the port the more gas can go through it, making it more effective. The further down the barrel the more leverage it had on the barrel for muzzle rise. Notice the hybrid comp ports above increase in size towards the end of the barrel.
Most Magnaporting I have seen on handguns are small longitudinal ports on top of the barrel - this may be somewhat effective for muzzle rise but much less effective for recoil.
If I understand the physics of what is happening correctly, the gases need to be somewhat directed to the rear to be effective for recoil and/or have some forward surface to push against.
I was skeptical about magnaporting until I fired the 329 PD with magna porting, WOW what a huge difference in rise and felt recoil
Velzey
I'm so tempted to put one if those brakes on my 1895 GBL