It really depends in what you like or not...
I know some people who use plastic cards, but I think one big downside is, that they don't fan as well
as "normal" cards - to be honest: the only fan which is ok with plastics is a pressure fan, I think
But if you like handling plastic cards and you don't want to fan them, it's no problem;
Just buy a plastic deck and a paper deck and play around with both.
You will see, which one fits for you.
- Konrad