igb vs igc network interfaces differences.

[Siarap]

Is there any advantages by using igc (i-226-v) interface over igb (i350-t2) interface? Do the newer driver/chipset/technology can improve: power consumption, ping , cpu load , bufferbloat or any other cases? i350 is 13 years old so it can be any disadvantage comparing to the i-226-v? Any differences beetwen igb and igc driver? I currently have i350-t2 but can buy for few dollars per piece single slot pci-e i-226-v cards rom china. Is it worth/worthless? Main difference is 1Gb vs 2,5Gb interface speed.