Why are you particular to those? Are those the two options you have as far as props that are right in front of it and you own?
Everyone is going to say it so I am going to beat them to it although we all know the answer.
They are going to ask, "what are you trying to do, racing or freestyle?"
THen your going to respond, "I want both".
But really, the more info the better on what you are trying to do. There really isn't a best impeller otherwise we'd all be running it and there wouldn't be a need for all the others! Some are pitched lower for low end, others higher for top, and pitch changes from brand to brand.
Are you trying to get more snap or go as fast as you can.
BTW, welcome to the forum.