Ported cylinder or non ported

Im upgrading my gen 8 gear box and as everyone knows im still learning this hobby so id like some opinions about if i should put a ported d cylinder or stay with the 100 percent non ported cylinder in my gen 8 m4a1

When choosing cylinder, i use this as a reference. Please note that this applies for 7.5 inner diameter of the inner barrel.

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Gen8 M4’s are traditionally around the 35cm length, so a 100% cylinder is around the normal size to use, but can also depend upon air sealing and different calculations if using an upgraded 7.3mm barrel instead of the standard 7.5mm size.