It is funny you asked this because I had the same dilemn on theses models.
After reviewing them both, I decided to buy Pioneer avh-p2400bt.
Here is why:
Front usb port.
Clarion manual says you can't use back usb port to load movies.
Clarion interface is basic, less customizable, but looks easier to use.
Pioneer has avrcp 1.3 on this model.
However, the Clarion has a bigger screen.
To me, theses two models are good.
To see if it fits your truck, I suggest you to visit
crutchfield.com, check for both radios and use the option "outfit my car".
Hope this helps!
P.S : I just bought radio today, can't tell about it for now //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif