Do you plan to keep plants? Festivums are lawnmowers, angels are not. If you aren't going to have plants, then I'd go with Festivums. They're really neat and far less common. Their appearance in person is quite impressive.
*** kept festivums before and angels. bred em both. only thing i can say about them is they are TIMID. do not put them in a tank where you walk by regularly. once they pair off its for life and eggs and such r soon to follow. they tend to be good parents after a few trys (much better then angels imo) as for plants they tend to favor soft leaf stuff. lillys and some sword nibbling. but honestly nothing too serious. just give em plenty of stuff to hide behind and im sure you will enjoy them a lot more then angels. GL to ya and lemme know if you have any trouble.