Wirelessly posted (BlackBerry8530/5.0.0.601 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)
It really depends on how you define "best." Cheapest? Fastest? Most luxurious?
You can see the options for transfers from LGA to Manhattan, and from Manhattan to EWR, in the FF Wiki, which you can find at
http://www.flyerguide.com