What was the Chinese bike ( cc's ) , 2-stroke or 4? If it was the typical chinese 4-stroke trail/play bike, either of the bikes you mention will be MUCH faster as well as better suspended, better handling, etc. It's a whole 'nother world as they say.
It really just depends on what your goals are... the 85 could be a good choice if you are out there just to have some fun. You didn't say where you ride (MX, Woods, open fields, etc)? The 85 will move someone your size pretty well, but clearly the 125 will grow with you as you improve / get more aggressive.
The seat height will be more comfortable for a newish rider on the 85, at 5-7" you won't be able to flat-foot the 125, but that happens to be the just about the average height of pro MX'ers ... so it's not like something you can't get used to.
With some answers to the questions above, we'll be able to make a more educated suggestion.