I really don't know or care which 14U-15U teams are the "best". My concern would be more about which 15U-17U teams do the best job of getting players into the Power Five D1's or MLB and which ones are the best at developing players, and (ultimately) which are the best at both of those key aspects of running a Travel Program.
No disrespect to 3and2, but not everyone can play at a Power Five D1, nor are there enough openings at these schools for those that can, especially if you are a position player. Sometimes I think everyone that posts here has pitcher sons.
(....and, ahem, you don't have to play at a Power 5 to get drafted).
You need to find a travel program that will showcase your child in front of college coaches, ie: goes to the right tournaments.
Secondly, you need to find a team that your son can actually play on. It does no good to be on a team where the coach's son plays MIF if that is also your son's position. Sometimes you won't know this until your son is already on the team. Then you move on.
Some teams/organizations will have "development", but plan to get some of that on your own. Son took separate hitting lessons, weight training with a professional, and separate running lessons all outside "the organization". One of the best things son did was throw with a pro pitcher that was home on rehab. It was set up by the weight trainer who worked with both. So how cool was that....that a sophomore in high school would just hang out and throw with a pitcher in the pros! Both got in needed throwing in the off season.
I have experience with several organizations in the Richmond VA area if you want to PM me.
Go to the team/organization websites and see where their players are from, where they are sending players to college, and if you see your son fitting in there. It will say volumes of what contacts the travel coaches have.
But ultimately, it will be up to the player to make the contacts and play well enough to garner offers.