First of all, which is more cost-effective than Canon 450 or 550?

Getting started, 450D is good, and now the cost performance is quite high.

And if you start to have a fever after using it for a while, you will put 550D and 450D in the cold room when preparing high-end cameras. Is it necessary to spend more than 1000 yuan?

Let's talk about another possibility first: after a period of time, I find that I am not interested in photography and the frequency of camera use is very low. Whether it is 450D or 550D, it has become a decoration. Are you still willing to spend so much money?

Unless you are determined to develop photography into an interest and don't plan to change equipment in a few years, you can buy an entry-level camera, and then you should buy 550D.

From the operational point of view, there seems to be no difference between the two, and it is unclear which one is better.