1/8 is better. You can concentrate on driving technique. The set-up is more easy ( no need to think about one-way, differential or spool ). No need to use tyre with different shore hardness at different time slot ( Just 32 front and 35 rear can fit almost all the track in HK ). The engine is more easy to tune and long lasting ( if properly run-in and keep it close to rich side, just remind you to use fuel with castor oil and use after-run oil immediately after use ).