The juries vote more about merits which is the big difference. I agree it's not about quality vs non quality. Musicians take music apart a little bit more looking it from a standpoint on how complex it is rather just going for the safe catchy melody, lyrics etc. they may look at it from different perspectives. In addition, they get to listen to the songs multiple times vs only once (for most viewers) which also can make a big difference to give the "non catchy" songs a fair shot!
In the end, it doesn't matter cause the jury won't go away.
In the end, it doesn't matter cause the jury won't go away.