Which one is more powerful and has better top speed - Hyosung GT250R or KTM RC 390?

The sure shot race winner would be the KTM RC 390. The GT250R is a twin cylinder motorcycle, but its under powered engine would not make it close to the power of the RC 390. KTM powers the bike with a single cylinder 373.2 cc engine producing 43 BHP @ 9000 rpm and 35 NM @ 7000 rpm. The machine performs exceptional due to its lightweight body and aerodynamically efficient design. It comes with ABS on both the wheels, making it more safe to brake on uneven roads. The bike touches the 100 kmph mark in 5.70 seconds only. It comes with a race inspired seating position, making the rider more comfortable on the speeding times. It comes with a price tag of INR 2,12,000.

KTM RC 390 - Racing Genes

RC390 hands down, though the former looks better in my opinion, the build and plastic quality of the KTM is worse than the other. Bottom Line: I'd still buy the KTM hands down as it's the most VFM but only for racing or the occasional canyon carving. For daily use choose the other one.