ermm.. my opinion.. if these 2 cars spent same amount of money.. i'd say kelisa is faster due to the power to weight ratio.. but however.. myvi has better chasis compare to it..
i've seen few kelisa with diff engine in it.. even YRV! no joke.. really..
handling wise.. i dunno much coz i nvr test myvi's limit(don dare to test la,new car ma) but let's say kelisa with L5 i think it's still ok.. but for the YRV i think it will be quite understeer coz of the heavy engine..
so wad i think is.. if u wanna mod..want a faster ride.. get a kelisa.. n yes u also can mod myvi.. but it's still a new car.. muz drive for some time den only mod lor.. but safety wise.. myvi is better..
juz my 2 cents la!!
cheers!!