i-dsi vs vtec in honda

today i was looking surfing around and finally found out the difference between the i-dsi and vtec engines. both of them are made by honda and i-dsi is a newer engine that honda made for the jazz for singapore. basically vtec is the honda trademark engine that is known to be powerful and fuel efficient. vtec works in a way where extra power will come in when the rev reached a certain level. in jazz, from what i read, vtec engine are more powerful when the rev is 3000rpm and above. the new i-dsi however is more powerful at lower rpm but would not be able to match up with the power of vtec when in high rev. in term of practical use, i do think that the i-dsi engine is better as normally the cars on the road dun rev up over 3000rpm and probably this is the main reason for honda to come out with this new engine. however, vtec engines are still very powerful and i love it more than the vvti engine by toyota. however honda is usually more ex compared to the fellow japanese cars among the same categories and i hope this could be change... cos i like honda!!!