parallel twin feels like a baby subaru sound while single cylinder sounded a bit like kapcai in my opinion..the duke parts generally will be more expensive compared to the z250 but single cylinder in future will be easier and lower to maintain compared to parallel twin (but not a big gap)

but if u compared parallel twin n inline 4( expenses big gap in future)

duke 390 just launched, its so new in the market..problems not yet been rectified so a bit dangerous to be a new buyer..haha but special in the sense that is still rare...KTM sparepart generally will be more expensive compared to Kawasaki somemore seeing DUKE 390 is bigger CC..parts definately more expensive than the Z250...it really depends on you which bike suits u more..basically u need to be sincere to urself on how much u basically earn minus with your commitment? gf/wife/family/car loan/car maintenance?..if u r driving perodua/proton range car..u gonna face problems that ur bike parts n maintenance generally almost the same or higher than the DUKE and Z250..so then be sincere bout it

i got no bike ...but curi curi using daddy cbr600f4i