Honda is the most reliable
Yamaha is close behind, Yamaha is reliable but they are made cheap.
Suzuki and Kawasaki are very similar, but are made generic and the dealerships are poorly run where there are no requirement or pride from any dealership that sells them, meaning any ripoff, lowlife person can own and sell Suzuki and Kawasaki bikes.
Honda and Yamaha dealerships are choosy, professional and are well run and managed