TC4 tub chassis would be a good choice if you are going to be running outside. It has a durable composite chassis, has enclosed diff cases, and is shaft drive. Batteries are held securely in place in the recessed tray and battery bar. It is a good car for someone who isn't primarily interested in racing. If you aren't going to be seriously racing, look for a good used TC4 tub chassis kit.
TC5 (any version) has a carbon fibre chassis and is a double-deck design. Diffs aren't enclosed and it is belt drive. You should consider using battery strapping tape to help secure a lipo battery to the chassis. If running the car outside you will want to pavement with a lot of small pebbles as they can get into the drive train. If you are planning on racing competitively this would be a good choice. Make sure to get some chassis protective material to prevent the bottom of the chassis from becoming scratched/damaged.