salamz.
bandit 400 is inline-4, DOHC, 16 valves
Gs500e is 487 cc, 4-stroke, air-cooled parallel twin, DOHC, 2 valves per cylinder
if you want sporty short and powerfull rides then go for bandit..it also sound very sweet
if you want ease of riding for long rides and economical fuel consumption go for gs500