Both are reliable if you do proper maintenance.

 

The vast majority of Toyota transmissions are pretty reliable. There are a few exceptions- like the shutter problem with early 7th Generation Camrys... but both automatic transmissions used on Gen 5 Camrys are pretty solid as long as no one has abused the car and basic maintenance has been followed. Even a Camry of that era that hasn't been properly maintained would likely have a more reliable transmission that most other midsize cars in the industry from that period.

Gen 5 transmissions can fail (no car is perfect), but it's extremely rare considering just how many Camrys Toyota sold back then. Just have a trusted independent mechanic give any car that you are seriously considering an inspection and you should be fine regarding the transmission.

 

Honestly every Toyota Transmission has issues yet there are no issues.

 

i have 2005 with 5 speed auto. 214,000 miles and transmission shifts smooth. Funny thing is original owner changed transmission fluid at 34,000 miles and after that never changed it. I changed it when i bought the car at 200k miles