Difference betweem a CRP-1 and E6B Flight computer ?

[mrbungle]

Newbie question, save the flaming !!

What's the difference betweem a CRP-1 and E6B Flight computer ?

Is it just Pooleys and Jeppesens variant ?

I'm looking to buy a flight computer, (trying to get som material and equipement together before starting PPL-> )

Thanks.