1.6 - rear anti roll bar 1.5 - nope
1.6 - 4 gear 1.5 - 3 gear
1.6 - 16 valve 1.5 - 12 valve
1.6 - FC better 1.5 - FC a bit higher
Basically, 1.6(A) is more performace and 1.5(A) is more to easy ride. 1.5(A) 3 gear box is not really underpower, is ok for town ride or mayber look for SE setup feel better performance and good handling. Yes, 1.5(A) engine sound a bit louder when after 110km/h.
I own and choose 1.5(A) instead 1.6(A) is due to 1.5(A) easy and less headache maintenance and I'm not look for performance. BTW, 1.5(A) still can go 140km/h is u wish to. But, I not say 1.6(A) is not good or 1.5(A) is better, it is really depends on you. Your need, your desire, your wallet and etc......
my 2 cents ....