As a member of both I see both differences and similarities. So here are the differences:
1) TAXI has listings of bonafide opportunities for artists and songwriters who are pitching themselves or their songs to labels or publishers. The songs in these opportunities actually have the potential to be cut an artist who may achieve rotational airplay on commercial radio and thus produce a hit. "Buy Me A Rose" by Kenny Rogers is the prime example of a TAXI success story. The song was written by two TAXI members who submitted the song to a listing and the rest is history. I personally saw those writers perform their song at a Road Rally before it became a hit and knew that the song would be a hit.

2)TAXI has a Road Rally every year where one can network in person with real industry people as well as other artists and songwriters.
3)TAXI has a forum on its website where members may post material for evaluation, network with other members, and promote themselves.

The similarities are:
1)TAXI and Broadjam have the film and TV opportunities for which their members have successfully placed many songs. Some TAXI members now can support themselves through their music because of the initial opportunity TAXI provided.
2)Like TAXI, Broadjam enables subscribers to have peer evaluation of their songs. However since the members who critique other's song are given points for credit to use for adding more of their own songs to their accounts, it appears that sometimes the evaluation one receives is just an exercise to earn those points. For example one could receive all ones or threes on a five point scale for all twelve of the song components being rated - with the bare minimum of comments.