I have used g502 and razed mamba

I’d say g502 is better..I noticed that g502 has more buttons but only the 2 side button can be used? Because other button cannot be assigned..

As for razer..I really like their design out of all brand but 3 of their peripheral fail me
Razer chroma. Led light dead
Razer chroma tourney edition . Sometimes button delay, and again led problem
Razer mamba - ok mouse.. but lately, the sensor gone haywire..

And the price..is expensive compared to Logitech
If u planning to upgrade once in a year u can buy razer

Usually razer become spoilt after 1 year plus.