use php classes for a plugin or not?

Hi people,

I’m trying to expand my php and wordpress knowledge by creating a massive project. Something like a shopping system plugin which u can use in wordpress.

Now I would like some suggestions before i start..

Is it better to create classes in your plugin.
like

if (!class_exists("DevloungePluginSeries")) {
? ? class DevloungePluginSeries {
? ? ? ? function DevloungePluginSeries() { //constructor
? ? ? ? ? ?
? ? ? ? }
? ?
? ? }
?
} //End Class DevloungePluginSeries

or is it better to not use these?

Because I’ve read lots of tutorials and some make use of classes and some don’t…

Thanks in advance!

[No bumping, thank you.]