Many darts have similar grips and barrel shapes now with minor differences, but sometimes that's all that's needed to make a vast difference for some players
With thousands of different styles of throws and grips all unique to different players it is really nice nowadays to have such a vast choice of darts. But it's a double edged sword as can make it hard to choose between darts when wanting to try something new.
Good luck to the lad but by now they are doing darts for players most fans haven't even seen play, they'll end up with 500 sets at this rate, and choices that don't sell.