Yep, Arlington is the club that practices at Long Bridge. A lot of Hill kids (including mine) play for Arlington. There are number of CFC alums. CFC is a fine little club, and it has some strong teams. But not all the teams/age groups are strong.
Long Bridge is the closest to the Hill of the Arlington practice fields, and Virginia Highlands (the field just south of the Pentagon City Costco) isn’t much farther. But some of the fields are much less convenient to the Hill, and if you’re driving from DC, it’s a bear at rush hour, which is when the younger teams usually start practice. You can also have practices at many fields in a single season, so there’s no way to “choose” your practice field. You get where your team is assigned.
All that being said, Arlington is a well-run club, and it offers a lot more runway than CFC if that’s something that’s important to you/your kid.