I think a mixture of platforms and straight ladders is the way to go in San Diego. Platforms are safer for FF's at top, are better to affect raised rescues. TDA's are good for maneuverability as mentioned above. i believe the TDA's have more storage capacity great for storing all the rescue tools these days. The newer Pierce Ascendant might offer attractive possibilities/performance with its single rear axle and 107 foot ladder, or option of 110 foot platform. Though you lose storage space. Also, time will tell how the Ascendant holds up with miles/wear & tear due to the heavy weight on chassis, suspension, etc..