Is there any difference between offline and online export ? i keep hearing from engineers thath sound wise its better to export track online .
would appreciate any feedback , Thanks
Usually a Pro Tools person will say this - and no, there is absolutely no difference whatsoever between the two (assuming your CPU can comfortably do a realtime bounce). Keep in mind that some DAWs like Pro Tools have only been able to do an offline export for a couple years, so PT users are sometimes unnecessarily suspicious 
Any differences between the two will be due to plugins with “random” circuits, i.e. spin in a reverb tail, analog modelling, etc - but the quality will always be the same.
Cheers!