Q. Currently using Bullet Classic 350 cc, planning to switch to Continental or Thunderbird 500 cc. Which would be better among the two?

GT sitting position is not suitable for city use. it's only good for highways. besides, you may consider interceptor. both of them have twin engine and more power than TBX500 obviously because of 650cc. if you are not going for long rides it's no use taking a bike with such high power output. TBX500 is good for both city rides, highways, long rides and lots of space for pillion. take test ride of all three , weigh your requirements and then select final model. happy riding.