celerons arent gonna be very good for production. the way ive always thought of them is theyre the pentiums that didnt quite pass the quality tests. for just reason and recycle you should be fine tho.
as far as which is better, its really hard to explain why one or the other is better. you just have to look at the results. for example, athlons kick the sh*t out of p4's in gaming. dont ask why, they just do. same with p4's and some multimedia stuff.
I play piano, guitar, drums, and trombone. I'm a regular one man band. Ask me something about computers, 90% of the time I'll have the answer.