I am new to buying a bike right now. I am looking at a used Tern X20, 2015 model and while doing some research, I came across this thread. Now I am a little hesitant. The price is in the same range as a used Brompton (all with very low use). The other bike I am considering it the Birdy. By the way, I am located in Hong Kong.

Any recommendations on which direction I should go. Mainly for riding around the neighbourhood and commuting on transit from time to time.

Thanks.