I think real is the best because they look better, and they eat up ammonia and nitrates. But you have to research your plants first, or you won't have much luck. If you have a relatively low light tank (what most standard tanks come with), you're not adding CO2 or ferts, then you're best with anubias, java ferns, moss balls and vallis.
If you have high/medium light, CO2 and ferts, then plant whatever you like!
Go over to the plant forum and read the stickies for more detailed info.