I think is utimately boils down to the songs one picks and that are absolutley melodious and musical and superhits. Song selection seems to be palying a very important role in public voting.
Having said all that, I can easily say that
1. Amanat has a mature voice and definitely sings melodiously.
2. Aneek has a very strong hold on variations in the tone, which will be absolutely wonderful once he matures into a man. He, I think can sing any kind of song with ease.
3. Raja is kind of a person who enjoys singing, period.
It is us, public, who feel that this guy's voice suits of this kinda music and so on an so forth. As a result, we become prejudiced to each voice and the songs they select to sing. Although they sing well and are technically correct, we correlate the song to the voice and judge them.
So, at this stage, they all are equally good. You just end up voting for who you like, unfortunately.