Importing psd or JPEG in Corel

Hello Guys!!!

My job involves frequently importing Photoshop edited Model Images into Corel.

My question is while importing which format is better .psd or .JPEG?

 Also I want to keep the file size as least as possible (with 300 dpi image ofcourse) 

I have noted that if I import .psd format image the Corel file becomes larger in size but when I save it in .pdf the file size reduces

Alternatively if i import .jpeg format image the Corel file becomes smaller in size but when I save it in .pdf the file size increases (Strange!!!)

Why is it so??? Also wanna know which of the two format is better if I have to send Print Magazine Ads to the agency??

Thanks 

Ruth.

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