The connections are better on pro... ie you are connected to more ultapeers if you are a leaf.. This will clearly give you better search ability. and I believe the speeds are a little faster, but many experienced users say there is no difference. I think there is a difference, but I have not sat down and measured it. The things I do like about pro is that you get rid of the update reminders
AND you are contributing a measly amount of money towards the development of a fine product.