Is an i-Size child safety seat more safe than the ECE r44 04 child safety seat?

I-size offers a more complete and up to date set of safety criteria, which gives a better guarantee that i-size child safety seat are safe. (For example: side impact criteria, measurement of head acceleration). The safety level of ECE r44 04 child safety seat can be at the same level when these criteria (amongst them: side impact protection) have been taken into account with the design of these seats. To comply with i-size the child safety seat have to offer for example also long floor supports and special labels BeSafe child safety seat have been designed with side impact protection and to a high safety level and do offer a comparable safety level to i-size child safety seat.