I like them both, but prefer the Houston's shape. However, it does look a little bulky for a shoulder bag (which bums me out because I'm dying to get a Houston in the pomme d'amour!)
per Eluxury:
Houston: 12 x 10 x 5
Brentwood: 11.5 x 15 x 3.7
so that's almost an inch and a half wider at the base. Do you live near an LV store where you can try them on? That will be the deciding factor for me because I need a shoulder bag, I can't do a handheld.