Q. Which is best bike for long touring without any problem Duke 250 ABS or RE Classic 350 ABS?

D250 is a better bike in this comparison, though both are from entirely different category. D250 is a whopping 40kgs lighter than RE350 ABS and has excellent suspension helping exceptional road dynamics. D250 also has good fuel economy with shorter travel times . The rider seat on D250 is quite comfortable for long distance riding and styling is meant for highspeed cruising with minimal wind resistance. It is also the more reliable motorcycle among the two.

It depends on your personality !!! most of the time not a big fan 350s !! boring as fuck but would prefer 650 for touring ...for now go for 250 as it is your first bike 250 has better performance and all

Both are different segments bikes. Both are OK with touring if your going under 100km/hr but above that RE gives vibrations. Also if your not a fan of heavy bikes prefer duke250