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So long as you dont go too wild then your better off with the stock ECU.
It takes quite a fancy and expensive standalone to even compare with modern OEM ECU's. OEM ECU's have to deal with alot, from the tip of the alps, to sub sea level in the Netherlands, from subzero to 70+ ambient temps. Emissions, economy, performance.
Most of the standalone ECU's fitted to tuned cars dont come close to the sophistication of the OEM ecu, they are just significantly easier to work with and the cars only need a fraction of the tuning, whereas production cars spend months on the dyno fine tuning.