im going to buy used scooter need advice

hello every body, im going to buy used scooter, i need advice from who have experiance here,.... i can say alot of scooter in here never know the brand china made in differant brand name as per the agent, i use yamaha max for 7 years, but its very qostly in egypt, i need advice which is better heavey duty , available spare part good service agent from, SYM 250CC, CF MOTO JET MAX 250, BENELI 250 or pls advice thax alot for all of you