Take a closer look at Designspark and you will find it's simply a very stripped down version of EasyPC with many of the features removed. Not worth considering in my opinion.
Iain is correct in his statement that many features of Easy-PC are not present in DesignSpark. At the last count there are in excess of 150 significant feature differences between the two, and this gap will only accelerate as DesignSpark tends to get about four new features each release whereas Easy-PC in its annual update tends to add at least 30.
Of course in the end it is down to personal choice and whether the basic features available in DesignSpark PCB are sufficient for your needs, but we are confident that the comparison between the two products does indeed stand up to scrutiny.