From my personal experience I have found that Canon PowerShot is better because it has way more options then the EOS Camera. Having more options means to me that better pictures can be taken, or different styles of pictures.
Canon eos rebel t3 slr is a better camera compared to canon eos rebel t2i
Newest Canon Powershot CameraThe newest Canon Powershot camera is The canon powershot sd3500is
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The cheapest Canon camera is the Canon PowerShot A2300 and costs $79.99. The most expensive Canon camera is the Canon EOS 5D Mark III and costs $3,899.99.
Canon PowerShot was created in 1995.
My favorite Powershot is the A550. My favorite powershot is the newest canon A2000
PowerShot A520
There are plenty of sites where you can get an useful information about canon powershot like at Canon Website
In terms of quality, the ranking of Canon cameras from lowest to highest among the models you mentioned is: Canon EOS Rebel T7, Canon EOS 90D, Canon EOS 5D Mark IV, and Canon EOS-1D X Mark III.
Yes, a Canon Powershot camera would be a good starter camera if you are just learning how to take great pictures. It has high mega pixels and a zoom for better shots.
One can read the reviews on the Canon PowerShot A640 by visiting Amazon which has many reviews created by customers who purchased the Canon PowerShot A640.
Absolutely yes. Canon EOS 450D has the same mount as Canon EOS 400D, wich is EF and EF-S.